heap overflow

About this tag
The heap overflow tag on WindowsForum.com covers disclosed vulnerabilities and patches for heap-based buffer overflow flaws in a variety of software, including DNS resolvers, image libraries, PDF renderers, debuggers, and office applications. Discussions focus on CVE entries such as CVE-2026-42944 in Unbound DNS, CVE-2026-3713 in libpng, CVE-2026-2648 in PDFium, CVE-2025-31344 in giflib, CVE-2023-39130 in GDB, CVE-2023-2804 in libjpeg-turbo, CVE-2026-21259 in Microsoft Excel, and CVE-2025-2912 in HDF5. Common themes include memory corruption from crafted inputs, the importance of patching, and the role of heap overflows in remote code execution or denial of service. The tag is relevant for IT professionals and developers tracking security updates and memory safety issues.

  1. CVE-2026-42944: Unbound DNS Heap Overflow Fix in 1.25.1 (Not a Windows DNS Bug)

    NLnet Labs disclosed CVE-2026-42944 on May 20, 2026, as a high-severity Unbound DNS resolver vulnerability affecting versions 1.14.0 through 1.25.0, where crafted queries containing multiple NSID, DNS Cookie, and EDNS Padding options can trigger a heap overflow and crash the service. The fix is...
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    • cve-2026-42944 dns security heap overflow unbound dns
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  2. CVE-2026-3713: Heap Overflow in libpng pnm2png Contrib Tool

    A newly disclosed vulnerability in the pnggroup libpng project—tracked as CVE-2026-3713—allows a specially crafted PNM image to trigger a heap-based buffer overflow in the library’s pnm2png utility, and a public proof-of-concept has already been published. This bug stems from an...

  3. CVE-2026-2648 Heap Overflow in PDFium Fixed in Chrome 145

    A newly disclosed high‑severity vulnerability in Chromium’s PDF rendering engine, PDFium, has been assigned CVE‑2026‑2648 and patched upstream in Chrome 145.0.7632.109 (and sibling builds). The flaw is a heap buffer overflow that — when triggered by a specially crafted PDF — can result in...
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    • chrome security cve 2026 2648 heap overflow pdfium
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  4. CVE-2025-31344: Giflib Heap Overflow Patch and Mitigation

    A heap‑based buffer overflow in the widely used giflib library — tracked as CVE‑2025‑31344 — has been publicly disclosed and fixed upstream after reports that the gif2rgb utility can be made to write past an allocated heap buffer when presented with a specially crafted GIF, creating crash and...

  5. GDB CVE-2023-39130: Heap Overflow in PE COFF Reader Explained

    A heap buffer overflow in GNU Debugger’s PE/COFF reader can crash the tool and, in narrow circumstances, may allow more serious memory corruption—CVE-2023-39130 exposes that weakness in the pe_as16() function inside coff-pe-read.c and underlines why even command‑line developer tools must be...
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    • cve 2023 39130 gdb vulnerability heap overflow software security
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  6. CVE-2023-2804: 12-bit JPEG heap overflow in libjpeg-turbo and patch guidance

    A heap‑based buffer overflow in libjpeg‑turbo’s merged upsampling code — tracked as CVE‑2023‑2804 — remains a practical reminder that long‑tail, niche JPEG features can produce high‑impact crashes and information‑security headaches across desktop, server and embedded ecosystems. The flaw is...
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    • cve 2023 2804 heap overflow libjpeg turbo twelve bit jpeg
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  7. CVE-2026-21259: Heap Overflow in Excel Demands Urgent Patch and Hardening

    Microsoft’s Security Response Center has registered CVE-2026-21259 as a heap‑based buffer overflow in Microsoft Excel that can be turned into a local elevation‑of‑privilege (EoP) condition — a serious class of vulnerability that demands immediate attention from patch and security teams even...
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    • excel security heap overflow microsoft office vulnerability management
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  8. CVE-2025-2912: Heap Overflow in HDF5 H5O_msg_flush Fixed in 1.14.6

    A heap-based buffer overflow has been disclosed in the HDF5 library that can be triggered while flushing object messages: the flaw exists in the function H5O_msg_flush in src/H5Omessage.c (tracked as CVE‑2025‑2912) and affects HDF5 releases up to and including 1.14.6. The issue can be provoked...
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    • cve 2025 2912 hdf5 vulnerability heap overflow security patch
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  9. CVE-2025-14178: PHP array_merge Heap Overflow Fixed in Latest Patches

    A newly assigned CVE (CVE-2025-14178) discloses a heap buffer overflow in PHP’s array_merge that can be triggered when a sequence of packed arrays causes integer overflow while precomputing element counts — a defect patched in PHP 8.1.34, 8.2.30, 8.3.29, 8.4.16 and 8.5.1 and now tracked across...
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    • array merge cve 2025 14178 heap overflow php security
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  10. HDF5 1.14.6 CVE-2025-7067 Heap Overflow Crashes Applications

    A heap‑based buffer overflow has been publicly disclosed in HDF5 1.14.6: the flaw resides in the free‑space serialization callback H5FS__sinfo_serialize_node_cb within src/H5FScache.c and can be triggered when an application processes crafted or corrupted .h5 files, producing a one‑byte...
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    • cve 2025 7067 hdf5 vulnerability heap overflow sanitizer trace
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  11. HDF5 CVE-2025-6818 Heap Overflow: Risks and Remediation for 1.14.6

    A heap-based buffer overflow has been publicly disclosed in HDF5 1.14.6 — tracked as CVE-2025-6818 — rooted in the H5O__chunk_protect routine inside src/H5Ochunk.c, creating a locally exploitable crash and potential memory‑corruption vector that defenders must treat seriously in any environment...

  12. HDF5 CVE-2025-6816 Heap Overflow: Risks, Fixes, and Mitigations

    A heap-based buffer overflow in HDF5’s object-header serialization has been publicly documented and fixed, and defenders need to treat it as a practical risk for any service or product that opens untrusted .h5 files: CVE‑2025‑6816 affects HDF5 1.14.6 in the function H5O__fsinfo_encode (file...
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    • cve 2025 6816 hdf5 vulnerability heap overflow security mitigation
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  13. CVE-2025-6269: HDF5 Heap Overflow in Cache Reconstruction

    A critical heap‑based buffer overflow affecting HDF5's cache reconstruction routine — tracked as CVE‑2025‑6269 — was disclosed in mid‑June 2025 and affects HDF5 releases up to and including 1.14.6; the flaw lives in the function H5C__reconstruct_cache_entry inside H5Cimage.c and can be triggered...
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    • cache reconstruction cve 2025 6269 hdf5 vulnerability heap overflow
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  14. CVE-2025-2914: HDF5 Heap Overflow in Free-Space Serialization

    A heap-based buffer overflow in the HDF5 library’s free-space serialization code (tracked as CVE‑2025‑2914) has been publicly disclosed and reproducible proof‑of‑concept material is available: the bug can be triggered when HDF5 v1.14.6 (and earlier, where present) processes crafted free‑space...
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    • cve 2025 2914 free space serialization hdf5 heap overflow
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  15. CVE-2025-2924 HDF5 Heap Overflow Explained and Mitigation

    A heap‑buffer overflow in HDF5’s heap-list deserialization routine — H5HL__fl_deserialize in src/H5HLcache.c — was disclosed in March 2025 as CVE‑2025‑2924; the flaw can cause out‑of‑bounds reads and heap corruption when the library processes crafted .h5 files, a proof‑of‑concept was published...
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    • cve 2025 2924 hdf5 heap overflow vulnerability
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  16. HDF5 CVE-2025-44904 Heap Overflow: Patch and Mitigation Guide

    A heap‑buffer overflow in a core HDF5 routine has thrown scientific-computing teams and Linux packagers into an urgent triage cycle: CVE‑2025‑44904 identifies a heap buffer overflow in HDF5 v1.14.6 rooted in the H5VM_memcpyvv function, and public proof‑of‑concept material and vendor tracking...
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    • cve 2025 44904 hdf5 vulnerability heap overflow supply chain security
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  17. HDF5 1.14.6 CVE-2025-44905: Heap Overflow in Scale Offset Filter

    HDF5 1.14.6 contains a heap buffer overflow in the Scale‑Offset filter (H5Z__filter_scaleoffset) that can be triggered by malformed HDF5 files and has been assigned CVE‑2025‑44905, creating a realistic denial‑of‑service and memory‑corruption risk for any software or service that reads untrusted...
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    • cve 2025 62455 hdf5 heap overflow scale offset filter
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  18. CVE-2025-64680: Windows DWM Heap Overflow Local Privilege Escalation

    Microsoft’s security index added CVE-2025-64680 on December 9, 2025 — a high‑impact elevation‑of‑privilege flaw in the Windows Desktop Window Manager (DWM) Core Library that vendors and multiple public trackers classify as a heap‑based buffer overflow with a CVSS v3.1 base score of 7.8 (High)...
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    • dwm vulnerability heap overflow privilege escalation windows security
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  19. ReFS CVE-2025-62456 Heap Overflow: Urgent Patch Guidance for Windows Resilient File System

    Microsoft’s security trackers list a newly published ReFS vulnerability — CVE-2025-62456 — as a high‑severity, heap‑based buffer‑overflow that can lead to remote code execution when the Resilient File System (ReFS) processes specially crafted inputs, and operators should treat the advisory as...
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    • cve 2025 62456 heap overflow refs vulnerability windows security
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  20. CVE-2025-62220 Patch: WSLg Heap Overflow in Windows GUI

    Microsoft disclosed a high‑severity heap‑based buffer overflow in the Windows Subsystem for Linux GUI (WSLg) that can allow code execution via crafted inputs; the flaw was recorded as CVE‑2025‑62220 with a CVSS v3.1 base score of 8.8 and was publicly posted on November 11, 2025. Immediate vendor...
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    • cve 2025 62220 heap overflow windows security wslg
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