CVE-2026-53783: Rsyncproject Rsync

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.

Affected products

• Rsyncproject Rsync: up to and including 3.4.4

Published 2026-08-13. Last modified 2026-09-08.