Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Samba | Rsync | < 3.4.3 |
Related Weaknesses (CWE)
References
- https://github.com/RsyncProject/rsync/pull/895/changes/8471fdd1561049ef5f58df44aPatch
- https://github.com/RsyncProject/rsync/releases/tag/v3.4.3Release Notes
- https://www.vulncheck.com/advisories/rsync-toctou-race-condition-allows-symlink-Third Party Advisory
FAQ
What is CVE-2026-29518?
CVE-2026-29518 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 replaci...
How severe is CVE-2026-29518?
CVE-2026-29518 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-29518?
Check the references section above for vendor advisories and patch information. Affected products include: Samba Rsync.