CVE-2026-59691

Name	CVE-2026-59691
Description	A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.
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)	bookworm, bookworm (security)	1.22.0-4+deb12u7	vulnerable
	trixie (security), trixie	1.26.2-3+deb13u3	vulnerable
	forky, sid	1.28.7-2	fixed

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)	1.28.5-1

Notes

[trixie] - gst-plugins-bad1.0 <no-dsa> (Minor issue)
https://gstreamer.freedesktop.org/security/sa-2026-0063.html
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12054
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/56f8cfd851ab640f1fd40ea983b6ea2affae3057 (1.28.5)
Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/d81d9f92d73aa3a689409973608962a62b64e926 (1.28.5)