CVE-2026-108411: Microsoft ODBC Driver Remote Code Execution Vulnerability

Here is a complete breakdown of the vulnerability mechanics, the exact official advisory details from the Microsoft Security Response Center (MSRC), and the precise KB-to-build remediation mappings required to secure your workstations and servers.

Vulnerability Overview and Official MSRC Telemetry​

At the core of CVE-2026-108411 is a classic memory safety weakness classified under CWE-122 (Heap-based Buffer Overflow). According to Microsoft's official description:

"Heap-based buffer overflow in Windows ODBC Driver allows an unauthorized attacker to execute code over a network."

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To ensure complete clarity for patch management teams, here are the official telemetry and status indicators established in the MSRC dossier for CVE-2026-108411:

• CVE ID: CVE-2026-108411
• Title: Microsoft ODBC Driver Remote Code Execution Vulnerability
• Severity: Important
• CVSS Base Score: 8.8
• CVSS Temporal Score: 7.7
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
• Weakness (CWE): CWE-122
• Exploitation Assessment: Exploitation Less Likely
• Publicly disclosed: No
• Exploited: No
• Customer action required: Yes

How the Attack Works: The Malicious Server Scenario​

Why does a Remote Code Execution (RCE) vulnerability with an 8.8 base score receive an "Important" severity rating rather than "Critical"? The answer lies in the attack direction and the requirement for user interaction (UI:R in the CVSS vector). Rather than an attacker sending an unsolicited packet to a listening service on a target machine, this is a client-side vulnerability triggered when a Windows machine reaches out to an untrusted data source.

Microsoft's official advisory facts explain the exact exploitation mechanics:

• Windows ODBC Driver Remote Code Execution Vulnerability: Heap-based buffer overflow in Windows ODBC Driver allows an unauthorized attacker to execute code over a network.
• How could an attacker exploit this vulnerability? An attacker could host a malicious server and convince a user to connect to it from an affected client. When the client processes the server's response, the attacker could execute code on the client system. User interaction is required.

From a practical IT security perspective, synthesized from general industry knowledge, think about how users and administrators interact with ODBC drivers in the real world. Whether someone is importing external data into a local reporting tool, testing a crafted Data Source Name (DSN) connection string provided in a phishing email, or connecting an application to a rogue database endpoint, the moment the vulnerable Windows ODBC Driver parses the specially crafted response from that malicious server, the heap-based buffer overflow (CWE-122) is triggered. Because the CVSS vector specifies PR:N (No privileges required by the attacker) and C:H/I:H/A:H (High impact to Confidentiality, Integrity, and Availability), successful exploitation allows the attacker to execute arbitrary code in the context of the client process.

Section Summary: CVE-2026-108411 is a network-accessible heap-based buffer overflow (CWE-122) in the Windows ODBC Driver. While it is neither publicly disclosed nor actively exploited at this time, it requires customer action to prevent client systems from being compromised by malicious database server responses.

Affected Products and Exact KB-to-Build Mappings​

Because the Windows ODBC Driver is built directly into the operating system across both client and server editions, this vulnerability touches legacy Long-Term Servicing Channel (LTSC) releases, modern Windows 11 feature updates, and Windows Server deployments from 2016 through 2025.

Below is the complete, authoritative table of affected products, the corresponding Microsoft security update Knowledge Base (KB) identifiers, and the vendor fixed builds.

Official Remediation Directives​

To remediate CVE-2026-108411, administrators must apply the appropriate update for each platform in their fleet. Note that several newer Windows 11 releases (24H2, 25H2, and 26H2) as well as Windows Server 2025 list two distinct KB and fixed-build pairings in the official MSRC remediation guidance.

Below is the exact remediation instruction for every affected product:

• For Windows 10 Version 1607 for 32-bit Systems (x86), install KB5131291 to reach fixed build 10.0.14393.9688.
• For Windows 10 Version 1607 for x64-based Systems, install KB5131291 to reach fixed build 10.0.14393.9688.
• For Windows 10 Version 1809 for 32-bit Systems (x86), install KB5131085 to reach fixed build 10.0.17763.9487.
• For Windows 10 Version 1809 for x64-based Systems, install KB5131085 to reach fixed build 10.0.17763.9487.
• For Windows 10 Version 21H2 for 32-bit Systems (x86), install KB5131096 to reach fixed build 10.0.19044.7846.
• For Windows 10 Version 21H2 for ARM64-based Systems, install KB5131096 to reach fixed build 10.0.19044.7846.
• For Windows 10 Version 21H2 for x64-based Systems, install KB5131096 to reach fixed build 10.0.19044.7846.
• For Windows 10 Version 22H2 for 32-bit Systems (x86), install KB5131096 to reach fixed build 10.0.19045.7846.
• For Windows 10 Version 22H2 for ARM64-based Systems, install KB5131096 to reach fixed build 10.0.19045.7846.
• For Windows 10 Version 22H2 for x64-based Systems, install KB5131096 to reach fixed build 10.0.19045.7846.
• For Windows 11 Version 23H2 for ARM64-based Systems, install KB5131087 to reach fixed build 10.0.22631.7711.
• For Windows 11 Version 23H2 for x64-based Systems, install KB5131087 to reach fixed build 10.0.22631.7711.
• For Windows 11 Version 24H2 for ARM64-based Systems, install KB5132043 to reach fixed build 10.0.26100.9911; install KB5132061 to reach fixed build 10.0.26100.9974.
• For Windows 11 Version 24H2 for x64-based Systems, install KB5132043 to reach fixed build 10.0.26100.9911; install KB5132061 to reach fixed build 10.0.26100.9974.
• For Windows 11 Version 25H2 for ARM64-based Systems, install KB5132043 to reach fixed build 10.0.26200.9911; install KB5132061 to reach fixed build 10.0.26200.9974.
• For Windows 11 Version 25H2 for x64-based Systems, install KB5132043 to reach fixed build 10.0.26200.9911; install KB5132061 to reach fixed build 10.0.26200.9974.
• For Windows 11 Version 26H1 for ARM64-based Systems, install KB5132059 to reach fixed build 10.0.28000.3501.
• For Windows 11 version 26H1 for x64-based Systems, install KB5132059 to reach fixed build 10.0.28000.3501.
• For Windows 11 Version 26H2 for ARM64-based Systems, install KB5132043 to reach fixed build 10.0.26300.9911; install KB5132061 to reach fixed build 10.0.26300.9974.
• For Windows 11 Version 26H2 for x64-based Systems, install KB5132043 to reach fixed build 10.0.26300.9911; install KB5132061 to reach fixed build 10.0.26300.9974.
• For Windows Server 2016 (Server Core installation) (x64), install KB5131291 to reach fixed build 10.0.14393.9688.
• For Windows Server 2016 (x64), install KB5131291 to reach fixed build 10.0.14393.9688.
• For Windows Server 2019 (Server Core installation) (x64), install KB5131085 to reach fixed build 10.0.17763.9487.
• For Windows Server 2019 (x64), install KB5131085 to reach fixed build 10.0.17763.9487.
• For Windows Server 2022 (Server Core installation) (x64), install KB5131090 to reach fixed build 10.0.20348.5870.
• For Windows Server 2022 (x64), install KB5131090 to reach fixed build 10.0.20348.5870.
• For Windows Server 2025 (Server Core installation) (x64), install KB5131077 to reach fixed build 10.0.26100.33730; install KB5131080 to reach fixed build 10.0.26100.33822.
• For Windows Server 2025 (x64), install KB5131077 to reach fixed build 10.0.26100.33730; install KB5131080 to reach fixed build 10.0.26100.33822.

Section Summary: Every affected Windows 10, Windows 11, and Windows Server edition has an official patch available. Administrators should verify that their endpoints reach the exact fixed build numbers listed above.

Practical Guidance for Windows Administrators​

While deploying the cumulative updates above is the definitive fix (RL:O — Official Fix available), enterprise security teams can also take practical steps based on general industry best practices to reduce their exposure window during patch rollouts:

1. Prioritize Workstations and Jump Hosts Used by Data Analysts and DBAs: Because exploiting CVE-2026-108411 requires convincing a user to connect an affected client to a malicious server, endpoints where users routinely configure external database connections, test unfamiliar data sources, or open third-party database files should be at the front of your patching queue.
2. Audit Outbound Database Traffic at the Perimeter: Even on a laptop or server that hasn't rebooted for its monthly patch yet, a client cannot process a malicious server's response if it cannot reach that server in the first place. Ensure outbound firewall rules restrict arbitrary database connection ports to known, trusted internal and cloud subnets rather than allowing unrestricted outbound connections to the open internet.
3. Verify Build Numbers Post-Deployment: Particularly on Windows 11 (24H2, 25H2, 26H2) and Windows Server 2025 where multiple KB packages (such as KB5132043 / KB5132061 and KB5131077 / KB5131080) map to their respective fixed builds, confirm that your endpoint management compliance queries check for the exact build numbers specified in the MSRC table above.

If you are tracking broader Windows 11 updates, Windows Server patching strategies, or enterprise cybersecurity advisories across your organization, check out our dedicated Windows Update and Security subforums here on WindowsForum.com to compare deployment notes with fellow IT pros.