CVE-2026-29518

Name	CVE-2026-29518
Description	Rsync versions before 3.4.3 contain a time-of-check to time-of-use (TOCTOU) race condition in daemon file handling that allows attackers to redirect file writes outside intended directories by replacing parent directory components with symbolic links. Attackers with write access to a module path can exploit this race condition to create or overwrite arbitrary files, potentially modifying sensitive system files and achieving privilege escalation when the daemon runs with elevated privileges. This vulnerability can only be triggered if the chroot setting is false.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4591-1, DSA-6282-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rsync (PTS)	bullseye	3.2.3-4+deb11u1	vulnerable
	bullseye (security)	3.2.3-4+deb11u4	fixed
	bookworm	3.2.7-1+deb12u4	vulnerable
	bookworm (security)	3.2.7-1+deb12u5	fixed
	trixie	3.4.1+ds1-5+deb13u2	vulnerable
	trixie (security)	3.4.1+ds1-5+deb13u3	fixed
	forky, sid	3.4.3+ds1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
rsync	source	bullseye	3.2.3-4+deb11u4	DLA-4591-1
rsync	source	bookworm	3.2.7-1+deb12u5	DSA-6282-1
rsync	source	trixie	3.4.1+ds1-5+deb13u3	DSA-6282-1
rsync	source	(unstable)	3.4.3+ds1-1

https://download.samba.org/pub/rsync/NEWS#3.4.3
https://www.openwall.com/lists/oss-security/2026/05/20/6