EUVD-2026-12131
CVSS Vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the processing of APS units. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28911.
Analysis
CVE-2026-3086 is an out-of-bounds write vulnerability in GStreamer's H.266 codec parser that allows remote code execution when processing malformed APS (Adaptation Parameter Set) units. The vulnerability affects all versions of GStreamer (CPE shows wildcard versioning) and requires user interaction to exploit, such as processing a malicious H.266 video file. …
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Remediation
Within 24 hours: Identify all systems and applications using GStreamer with H.266 codec support; segregate affected systems from critical networks if possible. Within 7 days: Implement input validation and network controls (see compensating controls); communicate risk to stakeholders and document exceptions. …
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External POC / Exploit Code
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