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CVE details

CVE-2026-94140

Rex versions through 1.16.1 for Perl accept an unknown SSH host key for remote rsync transfers because sync hardcodes StrictHostKeyChecking=no. Every remote branch of sync builds its ssh command with that option, for password authentication, for private-key authentication and for the fallback. The ssh options a caller sets through set_openssh_opt reach the OpenSSH transport but not this command, so there is no configuration that restores host key checking for the transfer. An attacker who can redirect the connection before the real host key is known presents their own and the transfer proceeds: under password authentication sync sends the connection password to that server, an upload writes the selected local files to it, and a download writes what it returns to the local destination.

Score
–
Published
2026-10-21
Links
NVD · cve.org

Matched ports (1)

PortPackageVersionStatusMaintainer
sysutils/p5-Rexp5-Rex1.16.1unaddressedsunpoet@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>p5-Rex</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Rex versions through 1.16.1 for Perl accept an unknown SSH host key
	for remote rsync transfers because sync hardcodes
	StrictHostKeyChecking=no.

Every remote branch of sync builds its ssh
	command with that option, for password authentication, for private-key
	authentication and for the fallback. The ssh options a caller sets
	through set_openssh_opt reach the OpenSSH transport but not this
	command, so there is no configuration that restores host key checking
	for the transfer.

An attacker who can redirect the connection before
	the real host key is known presents their own and the transfer
	proceeds: under password authentication sync sends the connection
	password to that server, an upload writes the selected local files to
	it, and a download writes what it returns to the local destination.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-94140</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-94140</url>
    </references>
    <dates>
      <discovery>2026-10-21</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>