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  4. CVE 2026 125255 ffmpeg through 902 use after free in mjpeg
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Back to active CVEs
Medium · CVSS 5.8CVE-2026-125255

FFmpeg through 9.0.2 Use-After-Free in MJPEG Hardware-Accelerated DecodingCVE-2026-125255

Answer in brief

CVE-2026-125255 records a Medium severity (CVSS 5.8) vulnerability in FFmpeg through 9.0.2 Use-After-Free in MJPEG Hardware-Accelerated Decoding. 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
Medium · CVSS 5.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.8. 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 <=9.0.2Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FFmpeg/FFmpeg.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

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 through 9.0.2 contains a use after free vulnerability in libavcodec/mjpegdec.c that allows attackers to trigger freed buffer reads by sending a SOF marker without a preceding SOI. Attackers can supply crafted MJPEG streams causing ff_mjpeg_decode_sof() to pass a stale raw_image_buffer pointer to hwaccel decoders like NVDEC, crashing applications or leaking heap contents.

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
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Nov 9, 2026
References
5 linked sources
Open source record