CVE-2026-52720

Name	CVE-2026-52720
Description	A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash.
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-bad1.0 (PTS)	bullseye	1.18.4-3+deb11u4	vulnerable
	bullseye (security)	1.18.4-3+deb11u6	vulnerable
	bookworm, bookworm (security)	1.22.0-4+deb12u7	vulnerable
	trixie (security), trixie	1.26.2-3+deb13u1	vulnerable
	forky	1.28.3-1	vulnerable
	sid	1.28.4-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gst-plugins-bad1.0	source	(unstable)	(unfixed)

https://bugzilla.redhat.com/show_bug.cgi?id=2486731
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5105 (private)