curl: CVE-2026-9547: SSH improper host validation

Hi all, We've found an issue in lib/vssh/libssh.c where the libssh backend maps SSHKNOWNHOSTSOTHER to CURLKHMATCHMISSING instead of CURLKHMATCHMISMATCH. libssh documents SSHKNOWNHOSTSOTHER as "The server gave us a key of a type while we had another type recorded. It is a possible attack."...

Curl 7.58.0 < 8.18.0 Multiple Vulnerabilities

The version of curl installed on the remote host is 7.58 = 8.17.0. It is, therefore, affected by multiple vulnerabilities when built with the libssh backend: - A key passphrase bypass vulnerability exists where curl wrongly authenticates using a locally running SSH agent even when specifically...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication via CURLSSHAUTHAGENT flag for public key authentication. An attacker can gain unauthorized access by leveraging a locally running SSH agent to bypass the intended key passphrase requirement. Note: This issue...