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CVE details

CVE-2026-117556

zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability in read_preface() in src/lib/header.c that passes the total header length instead of remaining bytes to compint parsing functions. Attackers can supply a crafted .zck file whose header ends inside a compressed integer, causing reads past the heap header buffer and crashing the application.

Score
5.3 medium
Published
2026-10-27
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
archivers/zchunkzchunk1.5.4unaddressedyuri@FreeBSD.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>zchunk</name>
	<range><lt>1.5.5</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability
	in read_preface() in src/lib/header.c that passes the total header
	length instead of remaining bytes to compint parsing functions.
	Attackers can supply a crafted .zck file whose header ends inside a
	compressed integer, causing reads past the heap header buffer and
	crashing the application.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-117556</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-117556</url>
    </references>
    <dates>
      <discovery>2026-10-27</discovery>
      <entry>2026-10-27</entry>
    </dates>
  </vuln>