CVE-2026-125229 FFmpeg through 9.0.2 Out-of-Bounds Memory Access in Huffyuv/FFVHUFF Median Predictor
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125229?
CVE-2026-125229 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Official description
FFmpeg through 9.0.2 contains an out-of-bounds memory access vulnerability in the encode_frame() function of libavcodec/huffyuvenc.c, because encode_init() never validates minimum frame dimensions for the median predictor. Attackers can supply a tiny video, such as a 2-pixel-wide or 1-2-pixel-tall frame, that causes negative sub_median_pred lengths and out-of-bounds reads and writes when transcoded to huffyuv or ffvhuff, crashing the encoder.
Weakness: CWE-787
Which versions are affected by CVE-2026-125229?
How do I fix CVE-2026-125229?
No fix has been published for CVE-2026-125229 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125229 being exploited?
There is no known exploitation of CVE-2026-125229 in the wild and no public exploit code.
Sources
Also known as GHSA-fvv9-x4pm-v3vq, UBUNTU-CVE-2026-125229.