---
id: CVE-2026-125066
title: FFmpeg through 9.0.2 NULL Pointer Dereference in CLJR Video Decoder
summary: >-
  FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in the
  Cirrus Logic AccuPak (CLJR) decoder in libavcodec/cljrdec.c because
  decode_frame() ignores init_get_bits() failure. Attackers can supply a crafted
  AVI file wit…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-252
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-09T21:06:33.478635Z'
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T21:07:00.209Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125066'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25704'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/d40c1b12811814fc6c2d0816527b003d8510ea06
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cljrdec.c#L54'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-null-pointer-dereference-in-cljr-video-decoder
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 NULL Pointer Dereference in CLJR
      Video Decoder
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.634Z'
---

## Overview

FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in the Cirrus Logic AccuPak (CLJR) decoder in libavcodec/cljrdec.c because decode_frame() ignores init_get_bits() failure. Attackers can supply a crafted AVI file with a 2^28-byte CLJR frame that overflows the bit count, causing reads from a NULL buffer and crashing the process.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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