Vulnerability in FFmpeg

[ Description ]Official description

FFmpeg 2.0 through 9.0.2 contains a use of uninitialized variable vulnerability in the Go2Meeting decoder that allows attackers to leak stack memory through out-of-range palette indices. Attackers can craft a G2M3/G2M4 stream with a short Kempf palette so kempf_restore_buf() copies uninitialized stack bytes, including pointers or stack guards, into decoded output.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund1 Nov 2026WID-SEC-2026-4282

  ffmpeg: Multiple vulnerabilities allow information disclosure Translated from German

  CVE-2026-120246CVE-2026-120210CVE-2026-120243+3 more CVEs

[ References ]References

• code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24858
• github.com/FFmpeg/FFmpeg
• github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/g2meet.c
• github.com/FFmpeg/FFmpeg/commit/edad2d0dafcf44fa315eab716fd0183ce808053b
• www.vulncheck.com/advisories/ffmpeg-2.0-through-9.0.2-information-disclosure-via-g2m-ke…