CVE-2026-94140 Affecting rex package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-REX-21431209
- published22 Oct 2026
- disclosed21 Oct 2026
Introduced: 21 Oct 2026
NewCVE-2026-94140 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 rex.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rex package and not the rex package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.