FERKI Rex up to 1.16.1 Sync Rsync.pm sync redirect

Summaryinfo

A vulnerability was found in FERKI Rex up to 1.16.1. It has been classified as problematic. Affected is the function sync of the file lib/Rex/Commands/Rsync.pm of the component Sync. This manipulation causes redirect. This vulnerability is tracked as CVE-2026-94140. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in FERKI Rex up to 1.16.1. Affected by this vulnerability is the function sync of the file lib/Rex/Commands/Rsync.pm of the component Sync. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at metacpan.org. This vulnerability is known as CVE-2026-94140 since 09/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/22/2026). MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-107576). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• FERKI

Name

• Rex

Version

• 1.16.0
• 1.16.1

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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