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CVE details

CVE-2026-65704

FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. The TY demuxer's demux_audio() function decrements packet size without bounds checking, producing a negative size value that is passed to memcpy() in shorten_decode_frame(), where conversion to size_t wraps the value to near SIZE_MAX and triggers reads beyond the source allocation and writes far beyond the Shorten decoder's bitstream buffer.

Score
7.3 high
Published
2026-07-23
Links
NVD · cve.org

Affected ports (3)

PortPackageVersionStatusMaintainer
multimedia/ffmpeg3ffmpeg33.0.2_1unaddressedkreinholz@gmail.com
multimedia/linux-rl9-ffmpeglinux-rl9-ffmpeg-libs7.1.5unaddressedemulation@FreeBSD.org
multimedia/ffmpeg4ffmpeg44.4.8_2possibly backportedmonwarez@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 contains an out-of-bounds write vulnerability
	that allows attackers to cause heap corruption by supplying a crafted
	ffconcat file processed with the -safe 0 flag. The TY demuxer's
	demux_audio() function decrements packet size without bounds checking,
	producing a negative size value that is passed to memcpy() in
	shorten_decode_frame(), where conversion to size_t wraps the value to
	near SIZE_MAX and triggers reads beyond the source allocation and
	writes far beyond the Shorten decoder's bitstream buffer.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-65704</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-65704</url>
    </references>
    <dates>
      <discovery>2026-07-23</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>