Net::LibSSH versions before 0.004 for Perl authenticate to an unverified server because connect never checks the host key against known_hosts

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-94423
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-21 22:16:50 UTC
Updated2026-10-22 01:17:00 UTC
DescriptionNet::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.

Risk And Classification

Problem Types: CWE-322 | CWE-322 CWE-322 Key Exchange without Entity Authentication

References

ReferenceSourceLinkTags
metacpan.org/release/GETTY/Net-LibSSH-0.004/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/10/21/29 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/Getty/p5-net-libssh/commit/29f509aacddb4b282ac9eb716d5ab32668... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: James Klein (en)

Additional Advisory Data

Solutions

CNA: Upgrade to Net-LibSSH 0.004 or later.

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