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rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade rsync | Sep 1, 2026 | Aug 13, 2026 |
| Debian | — | Upgrade rsync | Sep 30, 2026 | Aug 13, 2026 |
| Freebsd | — | Upgrade rsync | Aug 27, 2026 | Aug 25, 2026 |
| Oracle_linux | — | Upgrade rsync-rrsyncUpgrade rsyncUpgrade rsync-daemon | Oct 22, 2026 | Aug 13, 2026 |
| Redhat_linux | — | Upgrade rsync-rrsyncUpgrade rsyncUpgrade rsync-daemonUpgrade rsync-debuginfoUpgrade rsync-debugsource | Sep 16, 2026 | Aug 13, 2026 |
| Rocky_linux | — | Upgrade rsync-debugsourceUpgrade rsync-debuginfoUpgrade rsync | Sep 17, 2026 | Sep 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 15, 2026 | Aug 13, 2026 |
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