CVE-2026-108400
HEVC Video Extensions Remote Code Execution Vulnerability
Microsoft HEVC Video Extensions
CVSS
8.8HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.80%Chance of exploitation activity in the next 30 days, higher than 56% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 2.4.87.0HEVC Video ExtensionsCVE List
- 2.4.85.0HEVC Video Extensions for Licensed ApplicationsCVE List
- 2.5.25.0HEVC Video Extensions from Device ManufacturerCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Vendor and government advisories 1
Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.
Reports 1
1 outlet mention it. Reports are not confirmation; each links to its source.
Description
Integer overflow or wraparound in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.
Text from CVE List
Affected versions 3
- HEVC Video Extensionsaffected: 1.0.0 before 2.4.87.0CVE List
- HEVC Video Extensions for Licensed Applicationsaffected: 2.0.0.0 before 2.4.85.0CVE List
- HEVC Video Extensions from Device Manufactureraffected: 2.0.0.0 before 2.5.25.0CVE List