CVE-2026-70455
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductSamba Rsync
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- samba rsync3.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| samba rsync | 3.4.2 ≤ v < 3.5.0 | 3.5.0 |
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