rsync < 3.5.0 Algorithmic Complexity DoS via hash_search()
CVE-2026-70453 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.
rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU resources with a modest number of crafted entries, causing a sustained denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rsync · Debian 13.5 (trixie) | 3.5.0+ds1-0+deb13u1 | DEBIAN-CVE-2026-70453 | Aug 27, 2026 |
| rsync · Debian 14 | 3.5.0+ds1-1 | DEBIAN-CVE-2026-70453 | Aug 27, 2026 |
| rsync · RHEL 10 | 3.5.0-3.el10_2 | RHSA-2026:67463 | Aug 13, 2026 |
| rsync · RHEL 8 | 0:3.1.3-28.el8_10 | RHSA-2026:74095 | Oct 1, 2026 |
| rsync · RHEL 9 | 0:3.2.7-1.el9_8 | RHSA-2026:67462 | Sep 19, 2026 |
| rsync · almalinux 10 | 3.5.0-3.el10_2 | ALSA-2026:67463 | Sep 14, 2026 |
| rsync · almalinux 8 | 3.1.3-28.el8_10 | ALSA-2026:74095 | Sep 30, 2026 |
| rsync · almalinux 9 | 3.2.7-1.el9_8 | ALSA-2026:67462 | Sep 14, 2026 |
| rsync · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync · ol 10 | 0:3.5.0-3.el10_2 | ELSA-2026-67463-0 | Sep 16, 2026 |
| rsync · ol 8 | 0:3.1.3-28.el8_10 | ELSA-2026-74095 | Oct 1, 2026 |
| rsync · ol 9 | 0:3.2.7-1.el9_8 | ELSA-2026-67462-0 | Sep 16, 2026 |
| rsync · opensuse-leap 16.0 | 3.4.1-160000.6.1 | OPENSUSE-SU-2026:21650-1 | Aug 26, 2026 |
| rsync · rocky 10 | 0:3.5.0-3.el10_2 | RLSA-2026:67463 | Sep 15, 2026 |
| rsync · rocky 8 | 0:3.1.3-28.el8_10 | RLSA-2026:74095 | Oct 1, 2026 |
| rsync · rocky 9 | 0:3.2.7-1.el9_8 | RLSA-2026:67462 | Sep 15, 2026 |
| rsync · sles 15.6 | 3.2.7-150600.3.24.1 | SUSE-SU-2026:3657-1 | Aug 20, 2026 |
| rsync · sles 15.7 | 3.2.7-150600.3.24.1 | SUSE-SU-2026:3657-1 | Aug 20, 2026 |
| rsync · sles 16.0 | 3.4.1-160000.6.1 | SUSE-SU-2026:23323-1 | Aug 26, 2026 |
| rsync-daemon · RHEL 8 | 0:3.1.3-28.el8_10 | RHSA-2026:74095 | Oct 1, 2026 |
| rsync-daemon · RHEL 9 | 0:3.2.7-1.el9_8 | RHSA-2026:67462 | Sep 19, 2026 |
| rsync-daemon · almalinux 10 | 3.5.0-3.el10_2 | ALSA-2026:67463 | Sep 14, 2026 |
| rsync-daemon · almalinux 8 | 3.1.3-28.el8_10 | ALSA-2026:74095 | Sep 30, 2026 |
| rsync-daemon · almalinux 9 | 3.2.7-1.el9_8 | ALSA-2026:67462 | Sep 14, 2026 |
| rsync-daemon · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync-daemon · ol 10 | 0:3.5.0-3.el10_2 | ELSA-2026-67463-0 | Sep 16, 2026 |
| rsync-daemon · ol 8 | 0:3.1.3-28.el8_10 | ELSA-2026-74095 | Oct 1, 2026 |
| rsync-daemon · ol 9 | 0:3.2.7-1.el9_8 | ELSA-2026-67462-0 | Sep 16, 2026 |
| rsync-debuginfo · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync-debugsource · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync-rrsync · RHEL 9 | 0:3.2.7-1.el9_8 | RHSA-2026:67462 | Sep 19, 2026 |
| rsync-rrsync · almalinux 10 | 3.5.0-3.el10_2 | ALSA-2026:67463 | Sep 14, 2026 |
| rsync-rrsync · almalinux 9 | 3.2.7-1.el9_8 | ALSA-2026:67462 | Sep 14, 2026 |
| rsync-rrsync · ol 10 | 0:3.5.0-3.el10_2 | ELSA-2026-67463-0 | Sep 16, 2026 |
| rsync-rrsync · ol 9 | 0:3.2.7-1.el9_8 | ELSA-2026-67462-0 | Sep 16, 2026 |
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