# CVE-2026-70464: rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall CVE-2026-70464 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: High. - Web page: https://patchblox.com/security/cve/CVE-2026-70464 - Priority: High - CVSS: 8.2 (Important) - EPSS: 0.0064 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 13, 2026 - Weakness: Allocation of Resources Without Limits or Throttling - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70464 ## Description rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | rsync Debian 13.5 (trixie) | 3.5.0+ds1-0+deb13u1 | [DEBIAN-CVE-2026-70464](https://patchblox.com/security/data/fix/linux/debian-cve-2026-70464.md) | Aug 27, 2026 | | Linux | rsync Debian 14 | 3.5.0+ds1-1 | [DEBIAN-CVE-2026-70464](https://patchblox.com/security/data/fix/linux/debian-cve-2026-70464.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 2026-11-08T00:53:09Z UTC. 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