CVE-2026-81352Critical

Web Media Extensions Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.

Severity: Critical
CVSS base score: 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact: Remote Code Execution
EPSS, next 30 days: 0.5%Higher than 38.9% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability: Exploitation Unlikely
Publicly disclosed: No
Customer action: Required: apply the update
Component: Microsoft Windows Codecs Library
Weakness: CWE-122: Heap-based Buffer Overflow
Issued by: Microsoft
Published: 8 Sep 2026 · September 2026
Last revised: 8 Sep 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Windows

14 affected products

Web Media Extensions on Windows 10 Version 21H2 for 32-bit Systems
Web Media Extensions on Windows 10 Version 21H2 for ARM64-based Systems
Web Media Extensions on Windows 10 Version 21H2 for x64-based Systems
Web Media Extensions on Windows 10 Version 22H2 for 32-bit Systems
Web Media Extensions on Windows 10 Version 22H2 for ARM64-based Systems
Web Media Extensions on Windows 10 Version 22H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 23H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 23H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 24H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 24H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 25H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 25H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 26H1 for ARM64-based Systems
Web Media Extensions on Windows 11 version 26H1 for x64-based Systems