{"id":"CVE-2026-120243","title":"FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette","summary":"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 shor…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cvssSource":"cna","cwe":["CWE-457"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg >= 2.0 <= 9.0.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T18:55:04.988121Z"},"published":"2026-11-01","updated":"2026-11-06","sourceUpdated":"2026-11-06T18:55:15.270Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120243","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24858"},{"url":"https://github.com/FFmpeg/FFmpeg/commit/edad2d0dafcf44fa315eab716fd0183ce808053b"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/g2meet.c#L1040-L1042"},{"url":"https://github.com/FFmpeg/FFmpeg"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-2.0-through-9.0.2-information-disclosure-via-g2m-kempf-palette","label":"VulnCheck Advisory: FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette"}],"tags":["cve.org"],"epss":0.00124,"epssPercentile":0.02128,"ingestedAt":"2026-11-05T18:28:50.669Z","slug":"CVE-2026-120243","body":"## Overview\n\nFFmpeg 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.\n\n## Affected\n\n- `FFmpeg >= 2.0 <= 9.0.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}