CVE-2026-66037 | FFmpeg through 8.1.2, fixed in commit 5d7112c, contains an u… | CVSS 6.5 MEDIUM

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.

Metadata

CVE ID: CVE-2026-66037
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-23 20:45 UTC
Published: 2026-07-24 19:36 UTC
Last updated: 2026-07-24 19:36 UTC
Primary CWE: CWE-770
Allocation of Resources Without Limits or Throttling
Vendor / Product: FFmpeg / FFmpeg
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products (1)

Vendor	Product	Platform	Versions
FFmpeg	FFmpeg	—	0 ≤ 8.1.2, 86708357d126af84c16f80d9c57335d1e8c845c5

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	Allocation of Resources Without Limits or Throttling

CVSS scores (2)

Score	Severity	Version	Source	Vector
7.1	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References (3)