CVE-2026-66037
mediumpriority · track · 22EPSS 0.003 · 28 %ileDEEURUUSEPSS · scored 2026-10-27
FFmpeg through 8.1.2, fixed in commit 5d7112c, contains an uncontrolled resource consumption vulnerability in the IAMF demuxer that allows an unauthenticated attacker to cause multi-gigabyte memory allocation from a 17-byte input file by supplying a crafted count_label field. The mix_presentation_obu() function in libavformat/iamf_parse.c calls av_calloc(count_label, sizeof(*language_label)) with an attacker-controlled value before validating available OBU data, enabling an allocation amplification of approximately 126 million bytes per input byte that exhausts process memory or triggers an OOM-kill during format probing.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (18)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2526ffmpeg: Mehrere SchwachstellenDeutsch2026-07-26csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in ffmpeg ausnutzen, um eine Speicherbeschädigung herbeizuführen, beliebigen Code auszuführen, einen Denial-of-Service-Zustand auszulösen oder vertrauliche Informationen offenzulegen.
also known as (5)
Other names and identifiers for this entity.
sources
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references (9)
External citations — patches, advisories, analysis.
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/86708357d126af84c16f80d9c57335d1e8c845c5cnnvd
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23627cnnvd
- https://www.vulncheck.com/advisories/ffmpeg-iamf-demuxer-uncontrolled-resource-consumption-via-mix-presentation-obucnnvd
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/86708357d126af84c16f80d9c57335d1e8c845c5enisa_euvd
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23627enisa_euvd
- https://www.vulncheck.com/advisories/ffmpeg-iamf-demuxer-uncontrolled-resource-consumption-via-mix-presentation-obuenisa_euvd
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/86708357d126af84c16f80d9c57335d1e8c845c5Patchnvd
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23627Issue TrackingPatchnvd
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