CVE-2026-70455
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | 3.4.2 <= 3.4.4 | affected |
| RsyncProject | rsync | 3.5.0 | unaffected |
Weaknesses
- CWE-770: CWE-770 Allocation of Resources Without Limits or Throttling
References
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjvj-qgqg-cvx9
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
- https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaustion
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