CVE-2026-66037 Details
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.
A denial-of-service vulnerability has been identified in FFmpeg versions through 8.1.2, within the IAMF demuxer. This vulnerability allows an unauthenticated attacker to cause multi-gigabyte memory allocations from a 17-byte input file by crafting the count_label field. The issue arises in the mix_presentation_obu() function in libavformat/iamf_parse.c, where an attacker-controlled value is used to allocate memory for language labels without proper validation of the available data. This unbounded allocation can exhaust process memory or trigger an out-of-memory kill during format probing.
Users can upgrade to FFmpeg version 8.1.2 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 27, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ffmpeg ffmpeg | <= 8.1.2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 7, 2026 | Initial Analysis | [email protected] |
| Jul 27, 2026 | CVE Modified | CISA-ADP |
| Jul 24, 2026 | New CVE Received | [email protected] |