Allocation of Resources Without Limits or Throttling in Rsync - CVE-2026-70455
Published: August 13, 2026
Vulnerability identifier: #VU142269
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70455
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the rsync daemon sender when processing a PULL request with a large --compress-threads value. A remote attacker can send a request that names a large worker count to cause a denial of service.
A stock client is sufficient, and no crafted protocol is required. On anonymous modules, no authentication is required.
Affected software
Rsync
How to mitigate CVE-2026-70455
Install security update from vendor's website.
Rsync - update to 3.5.0