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CVE-2026-70455

8.7 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · sambaNVD modified 2026-10-23 18:10

Affected (CPE criteria) 1

  • cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*

References 3