---
id: CVE-2026-125178
title: FFmpeg through 9.0.2 Out-of-Bounds Heap Read via TDSC Cursor Dimensions
summary: >-
  FFmpeg through 9.0.2 contains an out-of-bounds heap read vulnerability in
  tdsc_load_cursor() in libavcodec/tdsc.c, which stores cursor dimensions before
  validating them. Attackers can supply a crafted AVI file with oversized TDSC
  cursor …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:11:04.895Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125178'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24682'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/12c589a37d093cc55618f8377b092dc21416806f
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/tdsc.c#L207'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-heap-read-via-tdsc-cursor-dimensions
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Out-of-Bounds Heap Read via TDSC
      Cursor Dimensions
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.615Z'
---

## Overview

FFmpeg through 9.0.2 contains an out-of-bounds heap read vulnerability in tdsc_load_cursor() in libavcodec/tdsc.c, which stores cursor dimensions before validating them. Attackers can supply a crafted AVI file with oversized TDSC cursor dimensions so tdsc_paint_cursor() reads past the cursor buffer, crashing the decoder or leaking heap memory into frames.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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