---
id: CVE-2026-125241
title: FFmpeg through 9.0.2 Heap Buffer Overflow via FLIC Decoder check_pixel_ptr
summary: >-
  FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in
  libavcodec/flicvideo.c that allows attackers to write out of bounds because
  check_pixel_ptr() checks only one bound with negative-stride frames. Attackers
  can supply a…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:11:50.066Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125241'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25702'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/27f612b306eb04f81138173f705df9a9b055b01d
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/flicvideo.c#L63'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-via-flic-decoder-check-pixel-ptr
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Heap Buffer Overflow via FLIC
      Decoder check_pixel_ptr
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.580Z'
---

## Overview

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/flicvideo.c that allows attackers to write out of bounds because check_pixel_ptr() checks only one bound with negative-stride frames. Attackers can supply a crafted FLIC file whose RLE and delta chunks write pixel data past frame storage, corrupting heap memory to crash applications or possibly execute code.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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