---
id: CVE-2026-107676
title: >-
  FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability
  in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes
  uninitialized when tone_mapping_flag is 0
summary: >-
  FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability
  in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes
  uninitialized when tone_mapping_flag is 0. Attackers can supply crafted
  Matroska T.35 Bl…
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'
cwe:
  - CWE-908
vendor: ffmpeg
product: ffmpeg
affected:
  - ffmpeg <= 9.0.2
published: '2026-10-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:55:20.810'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107676'
references:
  - url: >-
      https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2c2f6e96e31795ae95a8f8323a493ffbc493111f
    label: disclosure@vulncheck.com
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24590'
    label: disclosure@vulncheck.com
  - url: 'https://ffmpeg.org/'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/hdr_dynamic_metadata.c#L374-L385
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-disclosure-via-hdr10-metadata-serializer
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107676.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107676'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2548035'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-107676'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107676'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00142
epssPercentile: 0.03513
ingestedAt: '2026-10-08T15:49:37.998Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T00:59:44.930454Z'
---

## Overview

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes uninitialized when tone_mapping_flag is 0. Attackers can supply crafted Matroska T.35 BlockAdditional or HEVC/AV1 SEI metadata so that remuxing or transcoding writes leaked process memory into output files.

## Affected

- `ffmpeg <= 9.0.2`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · 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 2026-10-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107676.json)