Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ffmpeg | Ffmpeg | <= 8.1.2 |
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/86708357d126af84c16f80d9c57335d1e8cPatch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23627Issue TrackingPatch
- https://www.vulncheck.com/advisories/ffmpeg-iamf-demuxer-uncontrolled-resource-cThird Party Advisory
FAQ
What is CVE-2026-66037?
CVE-2026-66037 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 al...
How severe is CVE-2026-66037?
CVE-2026-66037 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66037?
Check the references section above for vendor advisories and patch information. Affected products include: Ffmpeg Ffmpeg.