---
id: CVE-2026-125268
title: FFmpeg through 9.0.2 Uninitialized Heap Memory Disclosure in CFHD Decoder
summary: >-
  FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability
  in the CineForm HD decoder that allows attackers to leak heap memory via
  unzeroed idwt_tmp buffers in libavcodec/cfhd.c. Attackers can supply a crafted
  CFHD f…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-908
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:12:08.871Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125268'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25718'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/0bfa350291b2118f6d590263dc1ee9cea766c0f1
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cfhd.c#L292'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-heap-memory-disclosure-in-cfhd-decoder
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Uninitialized Heap Memory
      Disclosure in CFHD Decoder
tags:
  - cve.org
ingestedAt: '2026-11-09T20:27:27.076Z'
---

## Overview

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in the CineForm HD decoder that allows attackers to leak heap memory via unzeroed idwt_tmp buffers in libavcodec/cfhd.c. Attackers can supply a crafted CFHD file with an ImageHeight tag exceeding coded band heights, causing uninitialized heap bytes to be filtered into decoded video output.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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