CVE-2026-120243
FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette
- State
- Published
- Severity
- 6.8 Medium
- Published
- Nov 1, 2026
- Updated
- Nov 1, 2026
- Reserved
- Oct 31, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.5 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-457 Use of Uninitialized Variable
Affected Products
| Product | Versions |
|---|---|
FFmpegFFmpeg |
|
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24858issue-tracking
- https://github.com/FFmpeg/FFmpeg/commit/edad2d0dafcf44fa315eab716fd0183ce808053bpatch
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/g2meet.c#L1040-L1042technical-description
- https://github.com/FFmpeg/FFmpegproduct
- VulnCheck Advisory: FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palettethird-party-advisory
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