PT-2026-64413 · FFmpeg · Ffmpeg

Adrian Junge · CVE-2026-66037 · Published 2026-07-24 · Updated 2026-07-24

NVD

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-66037

Affected Products

Ffmpeg

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-66037 · Security Note
• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/86708357d126af84c16f80d9c57335d1e8c845c5 · Patch
• https://vulncheck.com/advisories/ffmpeg-iamf-demuxer-uncontrolled-resource-consumption-via-mix-presentation-obu · Note
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23627 · Note