CVE-2026-3086

GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability

State: Published
Severity: 7.8 High
Published: Mar 13, 2026
Updated: Jul 15, 2026
Reserved: Feb 23, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.0	7.8 High	CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	zdi
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat-SADP

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
GStreamerGStreamer	1c6e163aa33962f5ee4a87d29319ccdd5cb67612Affected

References

ZDI-26-170
vendor-provided URLvendor-advisory
https://access.redhat.com/security/cve/CVE-2026-3086vdb-entry
RHBZ#2447493issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3086.json

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