HEVC Video Extensions: Heap-based buffer overflow enables code execution
Summary
A heap-based buffer overflow in Microsoft HEVC Video Extensions allows code execution. According to the CVE record, an attacker needs local access and no privileges, but a user must interact, most likely by opening a crafted media file. Successful exploitation could affect confidentiality, integrity and availability. The CVE record title says remote code execution while the vector is local, and the product name Windows Codecs Library in the initial description is unconfirmed.
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
Fixed in
- HEVC Video Extensions: 2.4.151.0 or later
- HEVC Video Extensions for Licensed Applications: 2.4.150.0 or later
- HEVC Video Extensions from Device Manufacturer: 2.4.149.0 or later
- Fixed versions taken from a third-party aggregator, not yet verified against the Microsoft advisory.
Workaround
Unknown. No vendor workaround has been identified. Removing the HEVC extension from systems where it is not needed reduces exposure (own suggestion, not from a source).
Exploitation
- Not known to be exploited.
- Not listed in the CISA KEV catalog.
- No public proof of concept found at the time of research.
Our recommendation
- Install the fixed HEVC Video Extensions versions through normal update channels, prioritising machines that open untrusted media, mail attachments or downloads.
- Check the Microsoft Security Update Guide entry for the final fixed builds and patch delivery details.
- Remove the HEVC extension where it is not required.
- Monitor for proof-of-concept code, exploitation reports and NVD analysis.
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 CVE-2026-114167 www.cve.org
- Microsoft Security Update Guide CVE-2026-114167 msrc.microsoft.com
- OffSeq Radar CVE-2026-114167 radar.offseq.com
- Strix CVE-2026-114167 www.strix.ai
- CWE-122 Heap-based Buffer Overflow cwe.mitre.org
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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