EUVD-2026-12121CVSS 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 Stack-based Buffer Overflow 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 parsing of decoding units. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28839.
Analysis
Stack-based buffer overflow in GStreamer's H.266 codec parser that allows remote code execution when processing malicious video files. The vulnerability affects all versions of GStreamer (CPE shows wildcard versioning) and requires user interaction to trigger, such as opening a malicious media file. …
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Remediation
Within 24 hours: Inventory all systems running GStreamer and identify business-critical applications dependent on H.266 codec support. Within 7 days: Implement user awareness training prohibiting opening untrusted video files and restrict GStreamer access to trusted media sources only. …
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