Net-LibSSH up to 0.003 Host Key Check connect improper authentication

Summaryinfo

A vulnerability was found in Net-LibSSH up to 0.003. It has been declared as critical. Affected by this vulnerability is the function connect of the component Host Key Check. Such manipulation leads to improper authentication. This vulnerability is listed as CVE-2026-94423. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Net-LibSSH up to 0.003. Affected by this issue is the function connect of the component Host Key Check. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at metacpan.org. This vulnerability is handled as CVE-2026-94423 since 09/21/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 0.004 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-107577). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Net-LibSSH

Version

• 0.003

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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