CVE-2026-53704

Name	CVE-2026-53704
Description	A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.
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)

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	vulnerable
	bookworm, bookworm (security)	1.22.0-2+deb12u2	vulnerable
	trixie (security), trixie	1.26.3-4+deb13u1	vulnerable
	forky	1.28.3-1	vulnerable
	sid	1.28.4-1	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	(unstable)	1.28.4-1

Notes

[trixie] - gst-plugins-ugly1.0 <no-dsa> (Minor issue)
https://gstreamer.freedesktop.org/security/sa-2026-0042.html
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11825
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11826 (1.28.4)
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11831 (1.26 branch)
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11832 (1.24 branch)