CVE-2026-125255

CVSS 5.8 (medium) · published 2026-11-09

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.

Weakness: CWE-416

Source: NVD CVE-2026-125255

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

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.