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Message-ID: <38cd471d-f5f7-4180-87c0-81ec6aef83a0@cpansec.org>
Date: Wed, 21 Oct 2026 22:24:59 +0100
From: Robert Rothenberg <rrwo@...nsec.org>
To: cve-announce@...urity.metacpan.org, oss-security@...ts.openwall.com
Subject: CVE-2026-94423: Net::LibSSH versions before 0.004 for Perl
authenticate to an unverified server because connect never checks the host
key against known_hosts
========================================================================
CVE-2026-94423 CPAN Security Group
========================================================================
CVE ID: CVE-2026-94423
Distribution: Net-LibSSH
Versions: before 0.004
MetaCPAN: https://metacpan.org/dist/Net-LibSSH
VCS Repo: https://github.com/Getty/p5-net-libssh
Net::LibSSH versions before 0.004 for Perl authenticate to an
unverified server because connect never checks the host key against
known_hosts
Description
-----------
Net::LibSSH versions before 0.004 for Perl authenticate to an
unverified server because connect never checks the host key against
known_hosts.
connect reports success as soon as ssh_connect returns SSH_OK. libssh
leaves the known-hosts check to the application, and this binding never
makes it, so the strict_hostkeycheck and knownhosts options are set on
the session and then decide nothing.
Password, agent and public-key authentication, channel and SFTP
operations all run on a session whose peer was never identified, so an
attacker who can redirect the connection receives the password when
password authentication is used, and commands and data sent over the
session.
Problem types
-------------
- CWE-322 Key Exchange without Entity Authentication
Solutions
---------
Upgrade to Net-LibSSH 0.004 or later.
References
----------
https://metacpan.org/release/GETTY/Net-LibSSH-0.004/changes
https://github.com/Getty/p5-net-libssh/commit/29f509aacddb4b282ac9eb716d5ab326686d09a4.patch
Credits
-------
James Klein, finder
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