---
id: CVE-2026-52296
title: >-
  FFmpeg before 9.0 has an out-of-bounds read because of missing required
  padding in WMA extradata allocation paths in libavcodec/wmaenc.c.
summary: >-
  FFmpeg before 9.0 has an out-of-bounds read because of missing required
  padding in WMA extradata allocation paths in libavcodec/wmaenc.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
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg < 9.0
published: '2026-09-13'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:56:19.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52296'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22988'
    label: cve@mitre.org
  - url: >-
      https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/23227a444de4a8f7696f46660cdd044b460f7e47
    label: cve@mitre.org
  - url: >-
      https://github.com/Kenan-Kamel/VulnerabilitiesReference/tree/main/FFmpeg/ExtradataPadding
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52296.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-52296'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532792'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-52296'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52296'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00158
epssPercentile: 0.05415
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T17:14:58.854308Z'
scores:
  nvd: 2.9
  cna: 2.9
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.468Z'
---

## Overview

FFmpeg before 9.0 has an out-of-bounds read because of missing required padding in WMA extradata allocation paths in libavcodec/wmaenc.c.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52296.json)