# CVE-2026-66037: ffmpeg: FFmpeg through 8.1.2, fixed in commit 5d7112c, contains an uncontrolled resource consumption vulnerability in the IAM...

CVE-2026-66037 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-66037, released July 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-66037
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 24, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ffmpeg Debian 14 | 7:9.0.2-1 | [DEBIAN-CVE-2026-66037](https://patchblox.com/security/data/fix/linux/debian-cve-2026-66037.md) | Jul 24, 2026 |
| Linux | ffmpeg-7 opensuse-leap 16.0 | 7.1.5-160000.1.1 | [OPENSUSE-SU-2026:21877-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21877-1.md) | Sep 18, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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