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CVE details

CVE-2026-70628

FFmpeg versions from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file. The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution.

Score
8.5 high
Published
2026-08-06
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>9</lt></range>
      </package>
      <package>
	<name>linux-rl9-ffmpeg-libs</name>
	<range><lt>9</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>FFmpeg versions from 0.5 up to, but not including, 9.0 contain a
	signed integer overflow vulnerability in the DVB subtitle parser in
	libavcodec/dvbsub_parser.c that allows attackers to trigger a heap
	buffer overflow by supplying a crafted WTV file. The overflow causes
	the bounds-check guard expression to wrap to INT_MIN, bypassing the
	PARSE_BUF_SIZE comparison and invoking memcpy() with
	attacker-controlled data into a heap buffer, resulting in an
	out-of-bounds heap write and potential memory corruption or code
	execution.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-70628</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-70628</url>
    </references>
    <dates>
      <discovery>2026-08-06</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>