VULNERABILITY INTELLIGENCE

CVE-2026-29518

CVSS score7 HIGH
EPSS probability0.15%
CISA KEVNot currently listed
Published2026-05-20
Last modified2026-08-19
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • disclosure@vulncheck.com: CWE-367
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-367

Primary references