CVE-2026-3086

Name	CVE-2026-3086
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1130059

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gst-plugins-bad1.0 (PTS)	bullseye	1.18.4-3+deb11u4	fixed
	bullseye (security)	1.18.4-3+deb11u5	fixed
	bookworm, bookworm (security)	1.22.0-4+deb12u6	fixed
	trixie	1.26.2-3	vulnerable
	forky, sid	1.28.1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Debian Bugs
gst-plugins-bad1.0	source	bullseye	(not affected)
gst-plugins-bad1.0	source	bookworm	(not affected)
gst-plugins-bad1.0	source	(unstable)	1.28.1-1	1130059

Notes

[bookworm] - gst-plugins-bad1.0 <not-affected> (Vulnerable code not present)
[bullseye] - gst-plugins-bad1.0 <not-affected> (Vulnerable code not present)
https://gstreamer.freedesktop.org/security/sa-2026-0009.html
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/aa1f5a80085ef65154a982dd3b23181100265c7e (main)
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/a2edc745bfea8835186a264c5e666be93f65a38e (1.28.1)