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CVE-2026-70455 is an uncontrolled resource-allocation denial-of-service vulnerability in rsync versions 3.4.2 through 3.4.4. The rsync daemon's refusal mechanism matches long option names but does not equivalently match the short --zt alias of the --compress-threads option. A remote sender can therefore bypass a configured refusal of the long option and submit a large compression-thread count. The receiving rsync process creates an unbounded number of Zstandard worker threads, exhausting available process/thread and memory resources. rsync 3.5.0 fixes the issue.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of 33 rsync security issues addressed by the FreeBSD advisory.
A vulnerability referenced in a Fedora security advisory for the rsync package; no specific technical details are provided in the content.
Unknown
A vulnerability fixed in version 3.5.0; no further details are provided in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.