HIGH 8.7 NVD
CVE-2026-70455
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 f
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.
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjvj-qgqg-cvx9
- https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaust
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-08-13 via NVD.
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