CVE details
CVE-2026-66039
FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.
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 aafb5c6, contains a signed
integer overflow vulnerability in the MACE6 audio decoder that allows
attackers to corrupt heap memory by supplying a crafted CAF file with
a malicious bytes_per_packet value. Attackers can craft a CAF file
with oversized bytes_per_packet and frames_per_packet values in the
desc chunk to trigger an integer overflow in mace_decode_frame()
during output sample count computation, resulting in an undersized
buffer allocation and heap out-of-bounds write that could enable code
execution.</p>
</body>
</description>
<references>
<cvename>CVE-2026-66039</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-66039</url>
</references>
<dates>
<discovery>2026-07-24</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>