CVE details
CVE-2026-66037
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.
Affected ports (3)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| multimedia/ffmpeg3 | ffmpeg3 | 3.0.2_1 | unaddressed | kreinholz@gmail.com |
| multimedia/linux-rl9-ffmpeg | linux-rl9-ffmpeg-libs | 7.1.5 | unaddressed | emulation@FreeBSD.org |
| multimedia/ffmpeg4 | ffmpeg4 | 4.4.8_2 | possibly backported | monwarez@mailoo.org |
Template for a VuXML entry
Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>FIXME -- FIXME</topic>
<affects>
<package>
<name>ffmpeg3</name>
<range><lt>FIXME</lt></range>
</package>
<package>
<name>linux-rl9-ffmpeg-libs</name>
<range><lt>FIXME</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>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.</p>
</body>
</description>
<references>
<cvename>CVE-2026-66037</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-66037</url>
</references>
<dates>
<discovery>2026-07-24</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>