CVE-2019-17539

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>3.4.7</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>In FFmpeg before 4.2, avcodec_open2 in libavcodec/utils.c allows a
	NULL pointer dereference and possibly unspecified other impact when
	there is no valid close function pointer.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2019-17539</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2019-17539</url>
    </references>
    <dates>
      <discovery>2019-10-14</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>