HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-70455 — rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows ...

·Source: NIST NVD

Updated:

Executive 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

Analysis

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. CVSS Score: 7.5. Published: 2026-08-13T15:19:59.197.

Indicators of Compromise (1)

CVE (1)
CVE-2026-70455
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 13, 2026. Verified by: NIST.

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