# CVE-2026-70452: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure CVE-2026-70452 is fixed in 5 products on 1 platform, first by RHSA-2026:67463, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2026-70452 - Priority: Urgent - CVSS: 8.2 (Critical) - EPSS: 0.0044 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 13, 2026 - Weakness: Incorrect Authorization - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70452 ## Description rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation. When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthorized access to restricted module file trees. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | rsync Debian 13.5 (trixie) | 3.5.0+ds1-0+deb13u1 | [DEBIAN-CVE-2026-70452](https://patchblox.com/security/data/fix/linux/debian-cve-2026-70452.md) | Aug 27, 2026 | | Linux | rsync Debian 14 | 3.5.0+ds1-1 | [DEBIAN-CVE-2026-70452](https://patchblox.com/security/data/fix/linux/debian-cve-2026-70452.md) | Aug 27, 2026 | | Linux | rsync RHEL 10 | 3.5.0-3.el10_2 | [RHSA-2026:67463](https://patchblox.com/security/data/fix/linux/rhsa-2026-67463.md) | Aug 13, 2026 | | Linux | rsync RHEL 8 | 0:3.1.3-28.el8_10 | [RHSA-2026:74095](https://patchblox.com/security/data/fix/linux/rhsa-2026-74095.md) | Oct 1, 2026 | | Linux | rsync RHEL 9 | 0:3.2.7-1.el9_8 | [RHSA-2026:67462](https://patchblox.com/security/data/fix/linux/rhsa-2026-67462.md) | Sep 19, 2026 | | Linux | rsync almalinux 10 | 3.5.0-3.el10_2 | [ALSA-2026:67463](https://patchblox.com/security/data/fix/linux/alsa-2026-67463.md) | Sep 14, 2026 | | Linux | rsync almalinux 8 | 3.1.3-28.el8_10 | [ALSA-2026:74095](https://patchblox.com/security/data/fix/linux/alsa-2026-74095.md) | Sep 30, 2026 | | Linux | rsync almalinux 9 | 3.2.7-1.el9_8 | [ALSA-2026:67462](https://patchblox.com/security/data/fix/linux/alsa-2026-67462.md) | Sep 14, 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 | 0:3.5.0-3.el10_2 | [ELSA-2026-67463-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67463-0.md) | Sep 16, 2026 | | Linux | rsync ol 8 | 0:3.1.3-28.el8_10 | [ELSA-2026-74095](https://patchblox.com/security/data/fix/linux/elsa-2026-74095.md) | Oct 1, 2026 | | Linux | rsync ol 9 | 0:3.2.7-1.el9_8 | [ELSA-2026-67462-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67462-0.md) | Sep 16, 2026 | | Linux | rsync opensuse-leap 16.0 | 3.4.1-160000.6.1 | [OPENSUSE-SU-2026:21650-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21650-1.md) | Aug 26, 2026 | | Linux | rsync rocky 10 | 0:3.5.0-3.el10_2 | [RLSA-2026:67463](https://patchblox.com/security/data/fix/linux/rlsa-2026-67463.md) | Sep 15, 2026 | | Linux | rsync rocky 8 | 0:3.1.3-28.el8_10 | [RLSA-2026:74095](https://patchblox.com/security/data/fix/linux/rlsa-2026-74095.md) | Oct 1, 2026 | | Linux | rsync rocky 9 | 0:3.2.7-1.el9_8 | [RLSA-2026:67462](https://patchblox.com/security/data/fix/linux/rlsa-2026-67462.md) | Sep 15, 2026 | | Linux | rsync sles 15.6 | 3.2.7-150600.3.24.1 | [SUSE-SU-2026:3657-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3657-1.md) | Aug 20, 2026 | | Linux | rsync sles 15.7 | 3.2.7-150600.3.24.1 | [SUSE-SU-2026:3657-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3657-1.md) | Aug 20, 2026 | | Linux | rsync sles 16.0 | 3.4.1-160000.6.1 | [SUSE-SU-2026:23323-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23323-1.md) | Aug 26, 2026 | | Linux | rsync-daemon RHEL 8 | 0:3.1.3-28.el8_10 | [RHSA-2026:74095](https://patchblox.com/security/data/fix/linux/rhsa-2026-74095.md) | Oct 1, 2026 | | Linux | rsync-daemon RHEL 9 | 0:3.2.7-1.el9_8 | [RHSA-2026:67462](https://patchblox.com/security/data/fix/linux/rhsa-2026-67462.md) | Sep 19, 2026 | | Linux | rsync-daemon almalinux 10 | 3.5.0-3.el10_2 | [ALSA-2026:67463](https://patchblox.com/security/data/fix/linux/alsa-2026-67463.md) | Sep 14, 2026 | | Linux | rsync-daemon almalinux 8 | 3.1.3-28.el8_10 | [ALSA-2026:74095](https://patchblox.com/security/data/fix/linux/alsa-2026-74095.md) | Sep 30, 2026 | | Linux | rsync-daemon almalinux 9 | 3.2.7-1.el9_8 | [ALSA-2026:67462](https://patchblox.com/security/data/fix/linux/alsa-2026-67462.md) | Sep 14, 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 | 0:3.5.0-3.el10_2 | [ELSA-2026-67463-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67463-0.md) | Sep 16, 2026 | | Linux | rsync-daemon ol 8 | 0:3.1.3-28.el8_10 | [ELSA-2026-74095](https://patchblox.com/security/data/fix/linux/elsa-2026-74095.md) | Oct 1, 2026 | | Linux | rsync-daemon ol 9 | 0:3.2.7-1.el9_8 | [ELSA-2026-67462-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67462-0.md) | Sep 16, 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 | 0:3.2.7-1.el9_8 | [RHSA-2026:67462](https://patchblox.com/security/data/fix/linux/rhsa-2026-67462.md) | Sep 19, 2026 | | Linux | rsync-rrsync almalinux 10 | 3.5.0-3.el10_2 | [ALSA-2026:67463](https://patchblox.com/security/data/fix/linux/alsa-2026-67463.md) | Sep 14, 2026 | | Linux | rsync-rrsync almalinux 9 | 3.2.7-1.el9_8 | [ALSA-2026:67462](https://patchblox.com/security/data/fix/linux/alsa-2026-67462.md) | Sep 14, 2026 | | Linux | rsync-rrsync ol 10 | 0:3.5.0-3.el10_2 | [ELSA-2026-67463-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67463-0.md) | Sep 16, 2026 | | Linux | rsync-rrsync ol 9 | 0:3.2.7-1.el9_8 | [ELSA-2026-67462-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67462-0.md) | Sep 16, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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