CVE-2026-66037 – FFmpeg IAMF Demuxer Uncontrolled Resource Consumption via mix_presentation_obu()

CVE ID :CVE-2026-66037

Published : July 24, 2026, 7:36 p.m. | 13 minutes ago

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.

Severity: 7.1 | HIGH

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