Microsoft HEVC Video Extensions: Remote code execution via heap-based buffer overflow
Summary
A heap-based buffer overflow in Microsoft HEVC Video Extensions allows code execution on the affected Windows system. The CVE record and CVSS vector describe a local attack vector that requires user interaction, for example opening a crafted media file. Successful exploitation would give an attacker the rights of the logged-in user, with high impact on confidentiality, integrity and availability. No exploitation has been reported as of publication.
Affected
- HEVC Video Extensions: 1.0.0 before 2.4.151.0
- HEVC Video Extensions for Licensed Applications: 2.0.0.0 before 2.4.150.0
- HEVC Video Extensions from Device Manufacturer: 2.0.0.0 before 2.4.149.0
- Windows build numbers: Unknown.
Fixed in
- HEVC Video Extensions: 2.4.151.0
- HEVC Video Extensions for Licensed Applications: 2.4.150.0
- HEVC Video Extensions from Device Manufacturer: 2.4.149.0
- Windows build and KB numbers: see MSRC advisory.
Workaround
Unknown. No vendor workaround found.
Exploitation
- Not known to be exploited (CVSS exploit code maturity: unproven).
- No public proof of concept found as of publication.
- Other November 2026 zero-days reported by Talos and Action1 are different CVEs.
Our recommendation
- Install the November 2026 update for HEVC Video Extensions through the normal patch cycle with high priority.
- Make sure Microsoft Store app updates are not blocked, as HEVC Video Extensions is typically updated that way.
- Prioritise Windows workstations that handle media files; servers are less relevant.
- Remind users not to open untrusted media files from email or downloads.
- Check the MSRC advisory for the exact builds and KB numbers.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record (Microsoft CNA) www.cve.org
- MSRC Security Update Guide msrc.microsoft.com
- OffSeq Threat Radar radar.offseq.com
- Strix CVE-2026-114165 www.strix.ai
- CWE-122 Heap-based Buffer Overflow cwe.mitre.org
- Talos Patch Tuesday November 2026 blog.talosintelligence.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 04:04.
Original description (NVD)
Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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