---
id: CVE-2026-52295
title: >-
  FFmpeg before 9.0 has an out-of-bounds read because the copied extradata
  lacked required padding before GetBitContext-based access in
  libavformat/iamf_writer.c.
summary: >-
  FFmpeg before 9.0 has an out-of-bounds read because the copied extradata
  lacked required padding before GetBitContext-based access in
  libavformat/iamf_writer.c.
severity: low
cvss: 2.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
  - CWE-120
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg < 9.0
published: '2026-09-01'
updated: '2026-09-13'
sourceUpdated: '2026-09-13T22:16:59.693'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52295'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22988'
    label: cve@mitre.org
  - url: >-
      https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/8439e0203744a30d280668fcd086f74ed5001da1
    label: cve@mitre.org
  - url: >-
      https://github.com/Kenan-Kamel/VulnerabilitiesReference/tree/main/FFmpeg/ExtradataPadding
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-07T10:58:23.439854Z'
epss: 0.00123
epssPercentile: 0.02401
ingestedAt: '2026-09-07T12:10:12.574Z'
---

## Overview

FFmpeg before 9.0 has an out-of-bounds read because the copied extradata lacked required padding before GetBitContext-based access in libavformat/iamf_writer.c.

## Remediation

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