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  4. CVE 2026 125209 ffmpeg before 813 and 9x before 902 heap buffer
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Back to active CVEs
High · CVSS 8.5CVE-2026-125209

FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow via dvdsubenc.cCVE-2026-125209

Answer in brief

CVE-2026-125209 records a High severity (CVSS 8.5) vulnerability in FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow via dvdsubenc.c. The current sources do not mark it as known exploited. The current feed maps FFmpeg/FFmpeg (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 9, 2026Updated Nov 9, 2026Source checked Nov 9, 2026First seen by HOL Nov 9, 2026Material review Nov 9, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FFmpeg/FFmpeg (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FFmpeg/FFmpeggeneric>=0 <8.1.3 || >=9.0 <9.0.28.1.3, 9.0.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FFmpeg/FFmpeg.
  2. 2Review the reported fix. Update FFmpeg/FFmpeg to 8.1.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 9, 2026

Sources and claim methodology

  • Source referencecode.ffmpeg.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap buffer overflow vulnerability in the DVD subtitle encoder that underestimates RLE output size for odd-width rectangles. Attackers can supply files with crafted bitmap subtitles that, when transcoded to the dvdsub encoder, write past the output buffer and corrupt heap memory.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • FFmpeg through 9.0.2 Heap Buffer Overflow via hap_parse_frame_header()Same ffmpeg/ffmpeg package
  • FFmpeg 8.0 through 9.0.2 Memory Leak in VP9 Decoder via vp9_decode_frameSame ffmpeg/ffmpeg package
  • FFmpeg through 9.0.2 Vorbis Parser CPU Exhaustion via Invalid ExtradataSame ffmpeg/ffmpeg package
  • FFmpeg through 9.0.2 NULL Pointer Dereference via aac_adtstoasc Bitstream FilterSame ffmpeg/ffmpeg package
  • FFmpeg through 9.0.2 Excessive Memory Allocation via SBaGen DemuxerSame ffmpeg/ffmpeg package
  • FFmpeg through 9.0.2 Heap Buffer Overflow via cbs_jpeg_write_scan Integer OverflowSame ffmpeg/ffmpeg package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-131
Source
CVE List V5
Source checked
Nov 9, 2026
References
5 linked sources
Open source record