# CVE-2026-29518: Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write CVE-2026-29518 is fixed in 5 products on 1 platform, first by rsync 3.1.2-2.1ubuntu1.6+esm3, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-29518 - Priority: High - CVSS: 8.1 (Important) - EPSS: 0.0015 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 19, 2026 - Weakness: Time-of-check Time-of-use (TOCTOU) Race Condition - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | rsync Debian 12.15 (bookworm) | 3.2.7-1+deb12u5 | [DEBIAN-CVE-2026-29518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-29518.md) | May 27, 2026 | | Linux | rsync Debian 13.5 (trixie) | 3.4.1+ds1-5+deb13u3 | [DEBIAN-CVE-2026-29518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-29518.md) | May 27, 2026 | | Linux | rsync Debian 14 | 3.4.3+ds1-1 | [DEBIAN-CVE-2026-29518](https://patchblox.com/security/data/fix/linux/debian-cve-2026-29518.md) | May 27, 2026 | | Linux | rsync RHEL 10 | 3.4.4-1.el10_2 | [RHSA-2026:26332](https://patchblox.com/security/data/fix/linux/rhsa-2026-26332.md) | May 20, 2026 | | Linux | rsync RHEL 8 | 0:3.1.3-27.el8_10 | [RHSA-2026:26408](https://patchblox.com/security/data/fix/linux/rhsa-2026-26408.md) | Jun 24, 2026 | | Linux | rsync RHEL 9 | 0:3.2.5-7.el9_8.2 | [RHSA-2026:26410](https://patchblox.com/security/data/fix/linux/rhsa-2026-26410.md) | Jun 24, 2026 | | Linux | rsync Ubuntu 18.04.6 LTS (bionic) | 3.1.2-2.1ubuntu1.6+esm3 | [rsync 3.1.2-2.1ubuntu1.6+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-rsync-3.1.2-2.1ubuntu1.6-esm3.md) | May 19, 2026 | | Linux | rsync Ubuntu 20.04 LTS (focal) | 3.1.3-8ubuntu0.9+esm1 | [rsync 3.1.3-8ubuntu0.9+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-rsync-3.1.3-8ubuntu0.9-esm1.md) | May 19, 2026 | | Linux | rsync Ubuntu 22.04.1 LTS (jammy) | 3.2.7-0ubuntu0.22.04.6 | [rsync 3.2.7-0ubuntu0.22.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-rsync-3.2.7-0ubuntu0.22.04.6.md) | May 27, 2026 | | Linux | rsync Ubuntu 24.04.5 LTS (noble) | 3.2.7-1ubuntu1.4 | [rsync 3.2.7-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-rsync-3.2.7-1ubuntu1.4.md) | May 27, 2026 | | Linux | rsync Ubuntu 25.10 (questing) | 3.4.1+ds1-5ubuntu1.2 | [rsync 3.4.1+ds1-5ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-rsync-3.4.1-ds1-5ubuntu1.2.md) | May 27, 2026 | | Linux | rsync Ubuntu 26.04.1 LTS (resolute) | 3.4.1+ds1-7ubuntu0.2 | [rsync 3.4.1+ds1-7ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-rsync-3.4.1-ds1-7ubuntu0.2.md) | May 19, 2026 | | Linux | rsync almalinux 10 | 3.4.4-1.el10_2 | [ALSA-2026:26332](https://patchblox.com/security/data/fix/linux/alsa-2026-26332.md) | Jun 16, 2026 | | Linux | rsync almalinux 8 | 3.1.3-27.el8_10 | [ALSA-2026:26408](https://patchblox.com/security/data/fix/linux/alsa-2026-26408.md) | Jun 16, 2026 | | Linux | rsync almalinux 9 | 3.2.5-7.el9_8.2 | [ALSA-2026:26410](https://patchblox.com/security/data/fix/linux/alsa-2026-26410.md) | Jun 16, 2026 | | Linux | rsync amzn 2023 | 3.5.1-1.amzn2023.0.1 | [ALAS2023-2026-3131](https://patchblox.com/security/data/fix/linux/alas2023-2026-3131.md) | Sep 28, 2026 | | Linux | rsync ol 10 | 0:3.4.4-1.el10_2 | [ELSA-2026-26332](https://patchblox.com/security/data/fix/linux/elsa-2026-26332.md) | Jul 16, 2026 | | Linux | rsync ol 8 | 0:3.1.3-27.el8_10 | [ELSA-2026-26408](https://patchblox.com/security/data/fix/linux/elsa-2026-26408.md) | Jun 16, 2026 | | Linux | rsync ol 9 | 0:3.2.5-7.el9_8.2 | [ELSA-2026-26410](https://patchblox.com/security/data/fix/linux/elsa-2026-26410.md) | Jun 23, 2026 | | Linux | rsync rocky 10 | 0:3.4.4-1.el10_2 | [RLSA-2026:26332](https://patchblox.com/security/data/fix/linux/rlsa-2026-26332.md) | Jun 19, 2026 | | Linux | rsync rocky 8 | 0:3.1.3-27.el8_10 | [RLSA-2026:26408](https://patchblox.com/security/data/fix/linux/rlsa-2026-26408.md) | Jun 17, 2026 | | Linux | rsync rocky 9 | 0:3.2.5-7.el9_8.2 | [RLSA-2026:26410](https://patchblox.com/security/data/fix/linux/rlsa-2026-26410.md) | Jun 17, 2026 | | Linux | rsync sles 16.0 | 3.4.1-160000.4.1 | [SUSE-SU-2026:22015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22015-1.md) | Jun 2, 2026 | | Linux | rsync-daemon RHEL 8 | 0:3.1.3-27.el8_10 | [RHSA-2026:26408](https://patchblox.com/security/data/fix/linux/rhsa-2026-26408.md) | Jun 24, 2026 | | Linux | rsync-daemon RHEL 9 | 0:3.2.5-7.el9_8.2 | [RHSA-2026:26410](https://patchblox.com/security/data/fix/linux/rhsa-2026-26410.md) | Jun 24, 2026 | | Linux | rsync-daemon almalinux 10 | 3.4.4-1.el10_2 | [ALSA-2026:26332](https://patchblox.com/security/data/fix/linux/alsa-2026-26332.md) | Jun 16, 2026 | | Linux | rsync-daemon almalinux 8 | 3.1.3-27.el8_10 | [ALSA-2026:26408](https://patchblox.com/security/data/fix/linux/alsa-2026-26408.md) | Jun 16, 2026 | | Linux | rsync-daemon almalinux 9 | 3.2.5-7.el9_8.2 | [ALSA-2026:26410](https://patchblox.com/security/data/fix/linux/alsa-2026-26410.md) | Jun 16, 2026 | | Linux | rsync-daemon amzn 2023 | 3.5.1-1.amzn2023.0.1 | [ALAS2023-2026-3131](https://patchblox.com/security/data/fix/linux/alas2023-2026-3131.md) | Sep 28, 2026 | | Linux | rsync-daemon ol 10 | 0:3.4.4-1.el10_2 | [ELSA-2026-26332](https://patchblox.com/security/data/fix/linux/elsa-2026-26332.md) | Jul 16, 2026 | | Linux | rsync-daemon ol 8 | 0:3.1.3-27.el8_10 | [ELSA-2026-26408](https://patchblox.com/security/data/fix/linux/elsa-2026-26408.md) | Jun 16, 2026 | | Linux | rsync-daemon ol 9 | 0:3.2.5-7.el9_8.2 | [ELSA-2026-26410](https://patchblox.com/security/data/fix/linux/elsa-2026-26410.md) | Jun 23, 2026 | | Linux | rsync-debuginfo amzn 2023 | 3.5.1-1.amzn2023.0.1 | [ALAS2023-2026-3131](https://patchblox.com/security/data/fix/linux/alas2023-2026-3131.md) | Sep 28, 2026 | | Linux | rsync-debugsource amzn 2023 | 3.5.1-1.amzn2023.0.1 | [ALAS2023-2026-3131](https://patchblox.com/security/data/fix/linux/alas2023-2026-3131.md) | Sep 28, 2026 | | Linux | rsync-rrsync RHEL 9 | 0:3.2.5-7.el9_8.2 | [RHSA-2026:26410](https://patchblox.com/security/data/fix/linux/rhsa-2026-26410.md) | Jun 24, 2026 | | Linux | rsync-rrsync almalinux 10 | 3.4.4-1.el10_2 | [ALSA-2026:26332](https://patchblox.com/security/data/fix/linux/alsa-2026-26332.md) | Jun 16, 2026 | | Linux | rsync-rrsync almalinux 9 | 3.2.5-7.el9_8.2 | [ALSA-2026:26410](https://patchblox.com/security/data/fix/linux/alsa-2026-26410.md) | Jun 16, 2026 | | Linux | rsync-rrsync ol 10 | 0:3.4.4-1.el10_2 | [ELSA-2026-26332](https://patchblox.com/security/data/fix/linux/elsa-2026-26332.md) | Jul 16, 2026 | | Linux | rsync-rrsync ol 9 | 0:3.2.5-7.el9_8.2 | [ELSA-2026-26410](https://patchblox.com/security/data/fix/linux/elsa-2026-26410.md) | Jun 23, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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