CVE-2026-2920

Name	CVE-2026-2920
Description	GStreamer ASF Demuxer Heap-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 processing of stream headers within ASF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28843.
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)
References	DLA-4516-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gst-plugins-ugly1.0 (PTS)	bullseye	1.18.4-2+deb11u1	vulnerable
	bullseye (security)	1.18.4-2+deb11u2	fixed
	bookworm, bookworm (security)	1.22.0-2+deb12u1	vulnerable
	trixie	1.26.3-4	vulnerable
	forky, sid	1.28.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gst-plugins-ugly1.0	source	bullseye	1.18.4-2+deb11u2		DLA-4516-1
gst-plugins-ugly1.0	source	(unstable)	1.28.1-1

Notes

https://gstreamer.freedesktop.org/security/sa-2026-0006.html
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/37d7991168a223d0810fd1f4493ec6a8b6a510d3 (main)
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/8f9c0adbe615caf95cf711d4548038db19e5749a (1.28.1)
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/3dc4244f030a0af077b9f87fd8ad50d4032428ef (1.26.11)
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/9f9d1f664546d99e5ca0c3ced216e76dd08b409f (1.24 branch)