Input validation error in Rsync - CVE-2026-53789
Published: August 13, 2026
Vulnerability identifier: #VU142290
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53789
CWE-ID: CWE-20
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 improper input validation in the rsync receiver file-list handling when processing file-list entries from a malicious sender under --delete or --force. A remote attacker can send crafted transfer-root or implied-parent entries to cause a denial of service.
User interaction is required to initiate a transfer from a malicious sender.
Affected software
Rsync
How to mitigate CVE-2026-53789
Install security update from vendor's website.
Rsync - update to 3.5.0