CVE-2026-12706

Name	CVE-2026-12706
Description	A use-after-free vulnerability was found in FFmpeg's RASC video decoder. The decode_move() function initializes a read pointer into a decompressed buffer, but a subsequent reallocation of that same buffer during move-table processing leaves the pointer dangling. An attacker could exploit this by providing a specially crafted AVI file containing a malicious RASC video stream. When a user opens or plays the file, the decoder reads from freed heap memory, which could lead to a denial of service (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
ffmpeg (PTS)	bookworm, bookworm (security)	7:5.1.9-0+deb12u1	fixed
	trixie (security), trixie	7:7.1.5-0+deb13u1	fixed
	forky, sid	7:8.1.2-2	fixed

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

Package	Type	Release	Fixed Version
ffmpeg	source	bookworm	7:5.1.9-0+deb12u1
ffmpeg	source	trixie	7:7.1.4-0+deb13u1
ffmpeg	source	(unstable)	7:8.1.1-1

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2490710
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22992
Fixed by: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/102c590a5f5c38fdbb2368672abda608727874dc (n8.1.1)
Fixed by: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/969e4ddf34f36d93d9b1dbafc5fec44e0e08e494 (n7.1.4)
Fixed by: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/0db9de2219a46884777576a7a40037489be986b4 (n5.1.9)