CVE-2026-12706 Ffmpeg: ffmpeg: heap use-after-free read in rasc decoder decode_move()
A use-after-free in FFmpeg's RASC decoder allows attackers to cause a denial of service via a crafted AVI file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-12706?
CVE-2026-12706 is a medium-severity use after free vulnerability in Red Hat Enterprise Linux AI (RHEL AI) 3, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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).
Weakness: CWE-416
Which versions are affected by CVE-2026-12706?
Linux distribution packages (1)
ffmpeg-7 openSUSE:Tumbleweed | All versions | 7.1.4-5.1 |
How do I fix CVE-2026-12706?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-12706 being exploited?
There is no known exploitation of CVE-2026-12706 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-12706, GHSA-qh4m-69pj-9vc2, OESA-2026-2827, OESA-2026-2828, UBUNTU-CVE-2026-12706, openSUSE-SU-2026:11361-1.