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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
disclosure@vulncheck.com https://github.com/RsyncProject/rsync/pull/895/changes/8471fdd1561049ef5f58df44a1811a50bd9a531d
disclosure@vulncheck.com https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
disclosure@vulncheck.com https://www.vulncheck.com/advisories/rsync-toctou-race-condition-allows-symlink-based-arbitrary-file-write
disclosure@vulncheck.com https://michael.stapelberg.ch/posts/2026-05-24-minimal-memory-safe-go-rsync-vulns/

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* rsync >= None < 3.4.3

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
rsync edge-main 3.4.3-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
rsync edge-main 3.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.4.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.2.4-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.2.4-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.2.3-r5 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.2.3-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.2.3-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync edge-main 3.1.2-r7 None possibly vulnerable
rsync 3.23-main 3.4.3-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
rsync 3.23-main 3.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.23-main 3.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.23-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.22-main 3.4.3-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
rsync 3.22-main 3.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.22-main 3.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.22-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.22-main 3.4.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.22-main 3.4.0-r0 None possibly vulnerable
rsync 3.22-main 3.2.4-r2 None possibly vulnerable
rsync 3.22-main 3.1.2-r7 None possibly vulnerable
rsync 3.21-main 3.4.3-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
rsync 3.21-main 3.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.3.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.21-main 3.2.4-r2 None possibly vulnerable
rsync 3.21-main 3.1.2-r7 None possibly vulnerable
rsync 3.20-main 3.4.3-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
rsync 3.20-main 3.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.20-main 3.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.20-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.20-main 3.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.20-main 3.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.20-main 3.2.4-r2 None possibly vulnerable
rsync 3.20-main 3.1.2-r7 None possibly vulnerable
rsync 3.19-main 3.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.19-main 3.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.19-main 3.2.7-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
rsync 3.19-main 3.2.4-r2 None possibly vulnerable
rsync 3.19-main 3.1.2-r7 None possibly vulnerable