CVE-2026-18393

Name	CVE-2026-18393
Description	A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond the bounds of a heap-allocated buffer when processing crafted TDSC cursor data. A remote attacker could exploit this by supplying a specially crafted video file, potentially leading to a denial of service or arbitrary code execution.
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
ffmpeg (PTS)	bookworm, bookworm (security)	7:5.1.9-0+deb12u1	vulnerable
	trixie (security), trixie	7:7.1.5-0+deb13u1	vulnerable
	forky	7:8.1.2-2	fixed
	sid	7:9.0.2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ffmpeg	source	(unstable)	7:8.1.1-1

Notes

[trixie] - ffmpeg <postponed> (Wait until fixed in 7.1.x upstream branch)
Fixed by: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c (n9.0)
Fixed by: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/031fae5c41e6200d3d9b593339be724857b2aacd (n8.1.1)