CVE-2026-94140
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
Rex versions through 1.16.1 for Perl accept an unknown SSH host key for remote rsync transfers because sync hardcodes StrictHostKeyChecking=no. SSH options set via set_openssh_opt do not reach this command, so no configuration restores host key checking for the transfer.
Risk Assessment
An attacker able to redirect the connection before the real host key is known can capture the connection password, uploaded files, or deliver malicious data to the local destination.
Recommendation
Upgrade Rex to a version later than 1.16.1 that fixes the issue, or avoid remote rsync transfers over untrusted networks until upgraded.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS