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VULNERABILITIES

CVE-2026-70455 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 [email protected]ProductRelease Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjvj-qgqg-cvx9 [email protected]Vendor Advisory
https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaustion [email protected]Release NotesThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

ProductVersions
samba rsync
>= 3.4.2, < 3.5.0

CPE

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

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-70455
NVD Published Date:
Aug 13, 2026
NVD Last Modified:
Aug 31, 2026
Source:
[email protected]
CVE-2026-70455 Details - Not Deferred