---
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'
---

## Overview

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.

## Affected

- `FFmpeg >= 2.0 <= 9.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.