Rex versions through 1.16.1 for Perl accept an unknown SSH host key for remote rsync transfers because sync hardcodes StrictHostKeyChecking=no
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.
CVE-2026-94140
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-94140
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/RexOps/Rex",
"modules": [
"Rex"
],
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "custom",
"lessThanOrEqual": "1.16.1"
}
],
"packageURL": "pkg:cpan/Rex",
"packageName": "Rex",
"programFiles": [
"lib/Rex/Commands/Rsync.pm"
],
"collectionURL": "https://cpan.org/modules",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "Rex::Commands::Rsync::sync"
}
]
}
]- Related CVEs
- CVE-2026-94140
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #50037 · Revision 1
- Added to Heist Feed
- Publisher date