CVE-2026-125255
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Nov 09, 2026
Vendor
unknown
Description
FFmpeg through 9.0.2 contains a use after free vulnerability in libavcodec/mjpegdec.c that allows attackers to trigger freed buffer reads by sending a SOF marker without a preceding SOI. Attackers can supply crafted MJPEG streams causing ff_mjpeg_decode_sof() to pass a stale raw_image_buffer pointer to hwaccel decoders like NVDEC, crashing applications or leaking heap contents.
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25231
- https://github.com/FFmpeg/FFmpeg
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/mjpegdec.c#L831
- https://github.com/FFmpeg/FFmpeg/commit/f58a6776546567367baf5223df9ffbfd289299f8
- https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-use-after-free-in-mjpeg-hardware-accelerated-decoding