A heap-based buffer overflow in gdk-pixbuf has emerged as a fresh reminder that image parsers remain high-value targets because they sit in the path of ordinary user workflows, automated thumbnailing, and desktop file preview systems. Microsoft’s Security Update Guide now tracks CVE-2026-5201 as a denial-of-service issue affecting JPEG processing, and Ubuntu’s advisory describes it as an improper validation bug in the JPEG loader that can be triggered by a specially crafted file. In practical terms, this is the kind of flaw that can take down applications, services, or even entire workflows that ingest untrusted images, especially when parsing happens automatically and repeatedly. (ubuntu.com)
Gdk-pixbuf is one of those invisible pieces of Linux and GNOME infrastructure that almost nobody notices until it breaks. It acts as a shared image loading library for desktop apps, icon themes, file managers, thumbnailers, preview panes, and any software stack that wants to decode common image formats without shipping a separate parser for each one. That ubiquity is exactly why security flaws in the library tend to have outsize effects: one bad parser can cascade across many applications at once.
The vulnerability behind CVE-2026-5201 is described as a heap-based buffer overflow in the JPEG image loader, caused by improper validation of color component counts when handling a crafted JPEG. Ubuntu says the result can be a crash and denial of service, while Microsoft’s update guidance records the CVE for downstream visibility in Windows-related security tracking. The practical takeaway is straightforward: the bug is in the file-decoding path, not in an exotic admin feature, and that makes it reachable in ordinary image-heavy environments. (ubuntu.com)
This is not a new pattern for image libraries. JPEG, PNG, GIF, BMP, TIFF, and their cousins have been fertile ground for memory-safety issues for decades because they combine complicated metadata parsing, arithmetic on sizes and counts, and large amounts of attacker-controlled input. The moment a decoder trusts a field like “number of components,” “dimensions,” or “stride” too early, a malformed image can turn into an undersized allocation, an out-of-bounds write, or a crash.
The broader security lesson is that availability bugs in parsing code are often treated as less dramatic than remote code execution, but they can still be operationally severe. A desktop session that keeps crashing whenever a folder is opened is not merely annoying; in shared environments, a thumbnailing service or preview daemon can be repeatedly knocked over, generating a rolling denial of service. Ubuntu explicitly notes that successful exploitation can cause application crashes and DoS, and it also flags possible arbitrary code execution in its notice, which makes the issue worth taking seriously even if the headline often centers on availability. (ubuntu.com)
The publication timing also matters. Ubuntu lists a publication date of 31 March 2026 and a last update of 8 April 2026, while its corresponding security notice was published on 8 April 2026. That tells us the issue moved through the normal disclosure and distribution-hardening pipeline quickly, which is typical for widely used open-source libraries that have to be patched across multiple supported releases. (ubuntu.com)
When those assumptions are wrong, the outcome is rarely graceful. The decoder may overrun a heap buffer, corrupt adjacent allocations, or hit a bounds-check and terminate. In the CVE-2026-5201 case, the public-facing description emphasizes crash potential and denial of service rather than confirmed code execution, but the underlying memory corruption still raises the stakes. (ubuntu.com)
The security impact depends heavily on context. A single-user desktop app that crashes once is bad; a server-side thumbnail generator that repeatedly processes user uploads can become a reliable denial-of-service target. That distinction is why the same bug can feel minor in a lab and serious in production.
Ubuntu’s note focuses on denial of service, but it also says the issue could possibly allow arbitrary code execution. That is a common pattern in vendor advisories for memory corruption bugs: vendors often avoid overpromising one specific impact when the exploitability depends on implementation details, mitigations, and the deployment model. (ubuntu.com)
That is why user interaction required is not always the right mental model for image-borne flaws. Sometimes the user never opens the image directly; the system does the parsing on their behalf. In those scenarios, the attack surface is broader than the application icon suggests.
This also explains why availability bugs can spread beyond a single process. If a shared thumbnailing service crashes, multiple front-end applications can lose previews until the service restarts. In a busy desktop or multi-tenant environment, repeated crash loops can create a persistent degradation rather than a one-time event.
That pattern is especially damaging in managed environments where file ingestion is centralized. One infected mailbox, upload bucket, or shared folder can become enough to trigger recurring failures in the parsing service. For administrators, the operational question is not just “can this crash?” but “what parts of the workflow depend on this parser being available?”
In other words, an availability issue can become a business interruption issue. For a help desk, repeated crashes look like vague user complaints. For an enterprise security team, they can translate into degraded service, support tickets, and lost productivity.
The Microsoft update guide’s wording reinforces the seriousness by including the CVE in its advisory ecosystem, which is one of the ways downstream platforms track Linux-originated library issues that matter to their own software supply chains. That does not mean Microsoft products are uniquely vulnerable here; it means the issue is important enough to monitor across ecosystems. (ubuntu.com)
That is why defenders should look at placement, not only score. If gdk-pixbuf is embedded in a user-facing workflow or shared backend, the operational risk is higher than the numeric rating alone suggests. If the library is present but rarely hit with untrusted JPEGs, the practical risk may be lower.
If you manage desktop fleets, don’t only patch servers. Gdk-pixbuf lives close to the desktop experience, where users routinely browse mixed-trust content. If you manage kiosks, VDI environments, or locked-down workstations, the same library may still be exposed through preview or indexing services.
A second step is to inventory the applications that depend on gdk-pixbuf directly or indirectly. That includes file managers, document viewers, image indexing services, mail clients, and any custom software using GTK-based loading code. The more places the library is called, the more likely one weak spot can be exploited.
Administrators should also consider whether image uploads are being scanned in privileged contexts. A service that decodes files with broad filesystem access can turn a crash into a broader reliability incident, even when the bug itself is “only” a DoS. Least-privilege service design helps contain the blast radius.
This is why image-library advisories tend to matter more on desktops than they look at first glance. The library may not be a visible application, but it underpins features users rely on constantly. Once the library crashes, the front-end app may become unstable even if it never explicitly “opened” the suspect file.
There is also a trust issue. Users tend to assume local previews are safe because they are passive. CVE-2026-5201 is a reminder that passive rendering is only safe if the parser underneath is robust. A malformed JPEG can still become an attack vector when the UI tries to be helpful.
Enterprises also need to think about image-heavy workflows in call centers, legal teams, marketing departments, and support organizations. These users often work with large volumes of customer-submitted content. That is exactly the kind of mixed-trust environment where a robust image parser matters most.
This is where availability bugs become operationally expensive. A repeated crash loop can consume retries, restart resources, and monitoring capacity. Even if the service comes back quickly each time, the surrounding platform may spend more time recovering than serving users.
There is a second-order risk as well: administrators may misdiagnose the issue as a transient infrastructure fault instead of a file-triggered parser bug. That slows response time and can let the attacker continue to deliver malformed inputs. In practical terms, the attacker does not need to “own” the server to keep it busy.
It is also worth checking whether image decoding is performed in the same process that handles authentication or database access. If so, the blast radius is too large. A better architecture isolates decoding into short-lived or sandboxed workers with tight permissions.
For vendors, the issue is as much about trust as technical correctness. If a product claims to support untrusted images safely, a parser crash undercuts that promise. If a distributor can ship patched packages quickly, that becomes a differentiator in security operations.
The wider ecosystem lesson is that memory-safe image handling is still an unsolved problem at scale. The long tail of file-format edge cases means every parser fix becomes a race between remediation and exploitability. That race is usually won by defenders only when they patch fast and isolate aggressively.
That is why advisories like this are valuable beyond the immediate patch. They remind maintainers and vendors alike that file parsing should be treated like network-facing code: hostile by default, bounded at every stage, and reviewed with an adversarial mindset.
There is also a larger strategic point. As more systems automate preview, indexing, OCR, and content analysis, they expose themselves to exactly the kind of untrusted input that parsing bugs thrive on. The best long-term defense is not only patching faster, but also reducing the privilege and persistence of services that ingest user content.
Source: MSRC Security Update Guide - Microsoft Security Response Center
Gdk-pixbuf is one of those invisible pieces of Linux and GNOME infrastructure that almost nobody notices until it breaks. It acts as a shared image loading library for desktop apps, icon themes, file managers, thumbnailers, preview panes, and any software stack that wants to decode common image formats without shipping a separate parser for each one. That ubiquity is exactly why security flaws in the library tend to have outsize effects: one bad parser can cascade across many applications at once.The vulnerability behind CVE-2026-5201 is described as a heap-based buffer overflow in the JPEG image loader, caused by improper validation of color component counts when handling a crafted JPEG. Ubuntu says the result can be a crash and denial of service, while Microsoft’s update guidance records the CVE for downstream visibility in Windows-related security tracking. The practical takeaway is straightforward: the bug is in the file-decoding path, not in an exotic admin feature, and that makes it reachable in ordinary image-heavy environments. (ubuntu.com)
This is not a new pattern for image libraries. JPEG, PNG, GIF, BMP, TIFF, and their cousins have been fertile ground for memory-safety issues for decades because they combine complicated metadata parsing, arithmetic on sizes and counts, and large amounts of attacker-controlled input. The moment a decoder trusts a field like “number of components,” “dimensions,” or “stride” too early, a malformed image can turn into an undersized allocation, an out-of-bounds write, or a crash.
The broader security lesson is that availability bugs in parsing code are often treated as less dramatic than remote code execution, but they can still be operationally severe. A desktop session that keeps crashing whenever a folder is opened is not merely annoying; in shared environments, a thumbnailing service or preview daemon can be repeatedly knocked over, generating a rolling denial of service. Ubuntu explicitly notes that successful exploitation can cause application crashes and DoS, and it also flags possible arbitrary code execution in its notice, which makes the issue worth taking seriously even if the headline often centers on availability. (ubuntu.com)
The publication timing also matters. Ubuntu lists a publication date of 31 March 2026 and a last update of 8 April 2026, while its corresponding security notice was published on 8 April 2026. That tells us the issue moved through the normal disclosure and distribution-hardening pipeline quickly, which is typical for widely used open-source libraries that have to be patched across multiple supported releases. (ubuntu.com)
What the Bug Appears to Be
At the center of the issue is a classic parser mistake: the code handling a JPEG file does not adequately validate the number of color components before it uses that information in memory-handling logic. If the component count is malformed or inconsistent with the rest of the file, the library can end up allocating or writing buffers incorrectly. That is the textbook setup for a heap-based overflow, where the damage lands in dynamically allocated memory rather than on the stack. (ubuntu.com)Why component validation matters
JPEG files are deceptively complex. They are not just image data; they are structured containers with markers, headers, tables, and fields that describe how the decoder should interpret the stream. A field as mundane as the component count can influence allocation size, stride calculations, and how many bytes the decoder expects to read or write.When those assumptions are wrong, the outcome is rarely graceful. The decoder may overrun a heap buffer, corrupt adjacent allocations, or hit a bounds-check and terminate. In the CVE-2026-5201 case, the public-facing description emphasizes crash potential and denial of service rather than confirmed code execution, but the underlying memory corruption still raises the stakes. (ubuntu.com)
The security impact depends heavily on context. A single-user desktop app that crashes once is bad; a server-side thumbnail generator that repeatedly processes user uploads can become a reliable denial-of-service target. That distinction is why the same bug can feel minor in a lab and serious in production.
The role of heap corruption
Heap overflows are dangerous because they affect memory used by the allocator and nearby objects. Depending on allocator behavior, build flags, and runtime conditions, the result can range from a clean crash to silent memory corruption. In image libraries, that often means the issue is practically exploitable as a DoS even when more advanced exploitation is not publicly demonstrated.Ubuntu’s note focuses on denial of service, but it also says the issue could possibly allow arbitrary code execution. That is a common pattern in vendor advisories for memory corruption bugs: vendors often avoid overpromising one specific impact when the exploitability depends on implementation details, mitigations, and the deployment model. (ubuntu.com)
- The bug sits in JPEG parsing, a high-frequency attack surface.
- The immediate effect is likely a crash or service outage.
- Heap corruption can be more than a simple segfault in some builds.
- Automatic image processing increases real-world exposure.
How Attackers Would Reach It
The most concerning feature of CVE-2026-5201 is that it does not appear to require a privileged local user or a complex multi-stage chain. Ubuntu explicitly says a remote attacker can exploit the flaw without user interaction, for example through thumbnail generation. That makes the bug especially relevant for desktops, cloud file-processing pipelines, and content management systems that inspect uploads automatically. (ubuntu.com)Thumbnailing and preview services
Modern Linux desktops routinely generate thumbnails as soon as a file is viewed in a file manager. Email clients and document portals may render inline previews, and enterprise content systems often scan attachments to generate searchable metadata or thumbnails. If any of those paths invoke gdk-pixbuf on untrusted JPEGs, then the vulnerable code may be reached simply by looking at a folder or opening a message list.That is why user interaction required is not always the right mental model for image-borne flaws. Sometimes the user never opens the image directly; the system does the parsing on their behalf. In those scenarios, the attack surface is broader than the application icon suggests.
This also explains why availability bugs can spread beyond a single process. If a shared thumbnailing service crashes, multiple front-end applications can lose previews until the service restarts. In a busy desktop or multi-tenant environment, repeated crash loops can create a persistent degradation rather than a one-time event.
Remote, automated, and repeated abuse
A malicious JPEG can be distributed through email, web uploads, chat attachments, or synced cloud folders. If a service indexes or previews that file, exploitation may happen on receipt rather than on explicit open. Repeated delivery can keep the service in a crash-restart cycle, effectively preventing normal operation.That pattern is especially damaging in managed environments where file ingestion is centralized. One infected mailbox, upload bucket, or shared folder can become enough to trigger recurring failures in the parsing service. For administrators, the operational question is not just “can this crash?” but “what parts of the workflow depend on this parser being available?”
- No user click may be needed.
- Automatic preview generation can trigger the bug.
- Shared parsing services multiply the blast radius.
- Repeated delivery can sustain the denial of service.
Severity and What It Means
On paper, the vulnerability is rated 7.5 High in Ubuntu’s CVSS 3 scoring, with availability impact emphasized and no confidentiality or integrity impact recorded in the score breakdown shown in the advisory. That combination often signals a bug that is highly reachable, easy to trigger, and disruptive enough to deserve rapid patching even if it is not a full compromise by itself. (ubuntu.com)Why availability still matters
Security teams sometimes underestimate denial-of-service issues because they do not immediately imply data theft or code execution. That is a mistake. If an attacker can reliably kill a shared image-processing daemon, they can disrupt login flows, content ingestion, search indexing, or desktop responsiveness depending on where the library is used.In other words, an availability issue can become a business interruption issue. For a help desk, repeated crashes look like vague user complaints. For an enterprise security team, they can translate into degraded service, support tickets, and lost productivity.
The Microsoft update guide’s wording reinforces the seriousness by including the CVE in its advisory ecosystem, which is one of the ways downstream platforms track Linux-originated library issues that matter to their own software supply chains. That does not mean Microsoft products are uniquely vulnerable here; it means the issue is important enough to monitor across ecosystems. (ubuntu.com)
Why CVSS is only part of the story
A 7.5 High score is significant, but it is not the whole story. A parser bug in a core library gets amplified by how widely the library is deployed, how often it touches untrusted content, and whether its failures are isolated or shared. A crash in a disposable utility is one thing; a crash in a shared desktop foundation component is another.That is why defenders should look at placement, not only score. If gdk-pixbuf is embedded in a user-facing workflow or shared backend, the operational risk is higher than the numeric rating alone suggests. If the library is present but rarely hit with untrusted JPEGs, the practical risk may be lower.
- CVSS captures severity, not exposure.
- Shared services increase impact.
- Untrusted-content pipelines are the danger zone.
- Availability-only bugs can still be urgent.
The Patch Picture
Ubuntu has already published package fixes for multiple releases, including 25.10 questing, 24.04 LTS noble, and 22.04 LTS jammy, which is a strong indicator that the issue is being handled as a mainstream maintenance problem rather than an edge-case bug. The specific package versions listed in the advisory are 2.42.12+dfsg-5ubuntu0.1 for 25.10, 2.42.10+dfsg-3ubuntu3.3 for 24.04 LTS, and 2.42.8+dfsg-1ubuntu0.5 for 22.04 LTS. (ubuntu.com)What administrators should do first
The simplest and most reliable response is to apply the vendor package update. Ubuntu’s notice says a standard system update will make the necessary changes, which is the right starting point for most fleets. In environments with package freezes or change-control windows, administrators should still prioritize this library because it sits in a common parsing path.If you manage desktop fleets, don’t only patch servers. Gdk-pixbuf lives close to the desktop experience, where users routinely browse mixed-trust content. If you manage kiosks, VDI environments, or locked-down workstations, the same library may still be exposed through preview or indexing services.
A second step is to inventory the applications that depend on gdk-pixbuf directly or indirectly. That includes file managers, document viewers, image indexing services, mail clients, and any custom software using GTK-based loading code. The more places the library is called, the more likely one weak spot can be exploited.
When compensating controls help
If immediate patching is not possible, the safest temporary mitigation is to reduce exposure to untrusted JPEGs. That can mean disabling automatic thumbnail generation in some environments, restricting file preview features, or sandboxing services that perform image decoding. Temporary controls are not a substitute for the update, but they can narrow the window of exposure.Administrators should also consider whether image uploads are being scanned in privileged contexts. A service that decodes files with broad filesystem access can turn a crash into a broader reliability incident, even when the bug itself is “only” a DoS. Least-privilege service design helps contain the blast radius.
- Patch the affected gdk-pixbuf packages.
- Identify all systems that preview untrusted images.
- Limit automatic thumbnailing where feasible.
- Sandbox or isolate image-processing services.
Why This Matters to Linux Desktops
For individual users, the most visible impact is probably not a dramatic exploit chain but an annoying and recurring crash. A file manager that freezes on a directory listing or a preview pane that dies on contact with a bad JPEG is enough to frustrate users and create the impression that the system is unstable. When the crash is repeatable, the user experience can become unusable until the offending file is removed.Desktop integration amplifies risk
Linux desktops often centralize image handling behind shared libraries for consistency and convenience. That design is elegant, but it also means a flaw in one codec can affect many front-end applications. A single bug in gdk-pixbuf can therefore ripple into GNOME Shell components, file browsers, mail clients, and other GTK-based apps.This is why image-library advisories tend to matter more on desktops than they look at first glance. The library may not be a visible application, but it underpins features users rely on constantly. Once the library crashes, the front-end app may become unstable even if it never explicitly “opened” the suspect file.
There is also a trust issue. Users tend to assume local previews are safe because they are passive. CVE-2026-5201 is a reminder that passive rendering is only safe if the parser underneath is robust. A malformed JPEG can still become an attack vector when the UI tries to be helpful.
Enterprise desktop fleets
In enterprise environments, the risk is multiplied by scale. If thousands of managed workstations automatically preview inbound email attachments or synced files, an attacker has many chances to trigger the same fault. Even if each crash is recoverable, the cumulative cost in help-desk work, lost focus, and incident triage can be substantial.Enterprises also need to think about image-heavy workflows in call centers, legal teams, marketing departments, and support organizations. These users often work with large volumes of customer-submitted content. That is exactly the kind of mixed-trust environment where a robust image parser matters most.
- File previews can trigger the bug unintentionally.
- Desktop convenience features widen exposure.
- Recovery from repeated crashes costs real time.
- Fleet-scale deployments magnify small faults.
Implications for Cloud and Content Platforms
The most serious operational exposure may actually sit outside the traditional desktop. Any platform that accepts user-uploaded images and generates derivatives—thumbnails, OCR inputs, moderation previews, search indexes, or content fingerprints—may rely on gdk-pixbuf or a similar decoder somewhere in the chain. That makes the vulnerability relevant to web apps, document management systems, and cloud storage providers as well as ordinary Linux desktops.Shared services are the weak point
When a single backend service handles decoding for many clients, a crash can knock out a whole segment of functionality. That is more than a nuisance if the service is part of login flows, moderation queues, or content publishing pipelines. One malformed file can block new uploads, delay approval workflows, or create a backlog that looks like a broader outage.This is where availability bugs become operationally expensive. A repeated crash loop can consume retries, restart resources, and monitoring capacity. Even if the service comes back quickly each time, the surrounding platform may spend more time recovering than serving users.
There is a second-order risk as well: administrators may misdiagnose the issue as a transient infrastructure fault instead of a file-triggered parser bug. That slows response time and can let the attacker continue to deliver malformed inputs. In practical terms, the attacker does not need to “own” the server to keep it busy.
File triage and hygiene
Cloud and content teams should review how JPEGs are validated before they reach image-processing stages. Input validation at upload time is not always enough, but it can reduce exposure to obviously malformed files. More importantly, parser-heavy services should run in constrained environments so that a crash does not take down unrelated workloads.It is also worth checking whether image decoding is performed in the same process that handles authentication or database access. If so, the blast radius is too large. A better architecture isolates decoding into short-lived or sandboxed workers with tight permissions.
- Check whether uploads flow through gdk-pixbuf.
- Isolate decoding from core application logic.
- Treat image previews as attack surface.
- Use service-level containment to reduce blast radius.
Competitive and Ecosystem Impact
Vulnerabilities like CVE-2026-5201 also expose the competitive reality of the Linux desktop and open-source application stack. The strength of the ecosystem is that many applications can share common libraries and benefit from rapid upstream fixes. The weakness is that a flaw in one dependency can become everyone’s problem at once.Why downstream vendors care
Ubuntu’s public advisory is one example, but the same library may be packaged across multiple distributions and embedded in products that never mention gdk-pixbuf in their user-facing marketing. That means downstream vendors need to track upstream JPEG-loader fixes closely, even when their own products are not directly named in the CVE description. Microsoft’s inclusion of the CVE in its guide reflects that cross-ecosystem reality. (ubuntu.com)For vendors, the issue is as much about trust as technical correctness. If a product claims to support untrusted images safely, a parser crash undercuts that promise. If a distributor can ship patched packages quickly, that becomes a differentiator in security operations.
The wider ecosystem lesson is that memory-safe image handling is still an unsolved problem at scale. The long tail of file-format edge cases means every parser fix becomes a race between remediation and exploitability. That race is usually won by defenders only when they patch fast and isolate aggressively.
The importance of upstream hygiene
Open-source maintainers already know that codecs are dangerous, but the cost of hardening remains high. Fuzzing, audit work, and defensive parsing are expensive, and every extra format branch introduces more code paths. The upside is that the same engineering discipline that catches one JPEG bug often prevents several future ones.That is why advisories like this are valuable beyond the immediate patch. They remind maintainers and vendors alike that file parsing should be treated like network-facing code: hostile by default, bounded at every stage, and reviewed with an adversarial mindset.
- Downstream packaging turns one bug into many tickets.
- Security trust depends on rapid patch delivery.
- Parser hardening is ecosystem maintenance, not optional polish.
- Image libraries need the same scrutiny as network daemons.
Strengths and Opportunities
The good news is that this class of bug is usually straightforward to mitigate once it is identified, and the ecosystem appears to have moved quickly to distribute fixes. Vendor advisories already identify affected releases and package versions, which reduces guesswork for administrators. That makes CVE-2026-5201 a classic case where disciplined patch management can substantially reduce risk.- The flaw is well localized to JPEG handling.
- Vendor guidance already points to fixed package builds.
- The issue is easy to prioritize because it affects a shared library.
- Administrators can reduce exposure through standard update workflows.
- The advisory is actionable for both desktops and server-side workflows.
- Isolation and sandboxing can shrink the blast radius.
- The bug reinforces the value of input validation and fuzzing.
Risks and Concerns
The concern is not just that a JPEG can crash a library, but that the library is embedded in workflows people assume are safe. Automatic previews, thumbnail generation, and upload processing all increase the chance that an attacker can trigger the bug without obvious interaction. Because the defect lives in a shared component, one exploit path may affect many applications at once.- Automatic parsing makes exploitation easier than users expect.
- Shared libraries amplify the impact of one malformed file.
- Repeatable crashes can become persistent denial of service.
- Some environments may miss the library because it is indirect dependency.
- Temporary mitigations may be hard to enforce uniformly.
- Misclassification as a “mere crash” can delay remediation.
- Memory corruption always leaves room for worse outcomes than the initial report suggests.
Looking Ahead
What matters now is whether organizations treat CVE-2026-5201 as a narrow image-parser bug or as a signal about broader file-handling risk. The right answer is the latter. Image decoding is one of the oldest and most recurring sources of memory-safety problems in desktop and server software, and every new disclosure reinforces the need for defense in depth.There is also a larger strategic point. As more systems automate preview, indexing, OCR, and content analysis, they expose themselves to exactly the kind of untrusted input that parsing bugs thrive on. The best long-term defense is not only patching faster, but also reducing the privilege and persistence of services that ingest user content.
- Verify whether gdk-pixbuf is present in your stack.
- Patch all affected systems on the fastest safe cadence.
- Reduce automatic processing of untrusted JPEGs where possible.
- Revisit sandboxing for thumbnailing and preview services.
- Watch for follow-on advisories affecting the same parsing path.
Source: MSRC Security Update Guide - Microsoft Security Response Center
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