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CVE-2026-29518 is a time-of-check to time-of-use race condition in rsync daemon mode affecting versions before 3.4.3. The flaw exists in daemon file handling when rsync is configured with the non-default setting use chroot = no, where path validation and file opening occur as separate operations. An attacker with write access to a module directory can replace a parent path component with a symbolic link after validation but before the file is opened, causing file operations to escape the intended module boundary. The issue affects daemon-side handling of file paths and can be used to redirect reads and writes outside the exported module. Rsync 3.4.3 fixes the issue by applying secure relative path opening protections in the vulnerable daemon code path.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
use chroot = no. Restrict write access to rsync module paths to trusted users only, minimize daemon privileges, and avoid running the daemon as root unless strictly necessary. These measures reduce exposure but do not replace upgrading to a fixed version.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A symlink-race TOCTOU vulnerability in rsync daemon referenced by the SUSE-SU-2026:3629-1 advisory, affecting the rsync package on SUSE Linux SLES12 hosts.
An rsync TOCTOU symlink race condition that allows local privilege escalation in daemon mode without chroot.
A symlink-race TOCTOU vulnerability in the rsync daemon when configured with 'use chroot = no'.
A TOCTOU symlink race vulnerability in rsync daemon mode that can allow arbitrary file reads and writes outside the intended module directory when rsync is configured with use chroot = no.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.