CVE-2026-108400: HEVC Video Extensions Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-31
Weakness: CWE-190

Description

Integer overflow or wraparound in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.

Affected products

Microsoft HEVC Video Extensions: from 1.0.0 before 2.4.87.0 — fixed in 2.4.87.0
Microsoft HEVC Video Extensions for Licensed Applications: from 2.0.0.0 before 2.4.85.0 — fixed in 2.4.85.0
Microsoft HEVC Video Extensions from Device Manufacturer: from 2.0.0.0 before 2.5.25.0 — fixed in 2.5.25.0

How to fix

Upgrade to a fixed version: Microsoft HEVC Video Extensions 2.4.87.0; Microsoft HEVC Video Extensions for Licensed Applications 2.4.85.0; Microsoft HEVC Video Extensions from Device Manufacturer 2.5.25.0. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108400

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