Improper Certificate Validation in Rsync - CVE-2026-70454
Published: August 13, 2026
Vulnerability identifier: #VU142268
CSH Severity: Medium
CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70454
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and tamper with transmitted data.
The vulnerability exists due to improper certificate validation in the rsync-ssl helper script when establishing TLS connections to an rsync daemon through affected backends. A remote attacker can perform a machine-in-the-middle attack using a certificate that is not properly verified to disclose sensitive information and tamper with transmitted data.
User interaction is required because a user must invoke rsync-ssl.
Affected software
Rsync
How to mitigate CVE-2026-70454
Install security update from vendor's website.
Rsync - update to 3.5.0