rsync: TOCTOU symlink race condition allowing local privilege escalation in daemon mode without chroot.

A flaw was found in rsync. An rsync daemon configured with "use chroot = no" is exposed to a time-of-check / time-of-use race on parent path components. A local attacker with write access to a module can replace a parent directory component with a symlink between the receiver's check and its open...

CLSA-2026-1779694460 Fix CVE(s): CVE-2026-29518

SECURITY UPDATE: daemon-no-chroot TOCTOU symlink race - debian/patches/CVE-2026-29518.patch: track per-module chroot in amchrooted and usesecuresymlinks; route the sender's read-path open, the receiver's basis-file open, mkstemp, and inplace write through securerelativeopen / securemkstemp -...

USN-8283-1 rsync vulnerabilities

Calum Hutton discovered that rsync contained a heap-based out-of-bounds read when handling file transfers. A remote attacker with read access to an rsync server could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.1...

SUSE CVE-2004-0426

rsync before 2.6.1 does not properly sanitize paths when running a read/write daemon without using chroot, which allows remote attackers to write files outside of the module's path...

security flaw

rsync before 2.6.1 does not properly sanitize paths when running a read/write daemon without using chroot, which allows remote attackers to write files outside of the module's path...