CVE-2019-3464: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 4.7% chance of exploitation in the next 30 days.

Insufficient sanitization of environment variables passed to rsync can bypass the restrictions imposed by rssh, a restricted shell that should restrict users to perform only rsync operations, resulting in the execution of arbitrary shell commands.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Fedoraproject Fedora: version 29 only; version 30 only; version 31 only
• Pizzashack Rssh: version 2.3.4 only

Published 2019-02-06. Last modified 2026-06-17.