This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-53783 →

UBUNTU-CVE-2026-53783

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 au...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV