CVE-2026-70454
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
CVSS Score
8.0
EPSS Score
0.0%
EPSS Percentile
0th
rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.
| CWE | CWE-295 |
| Vendor | rsyncproject |
| Product | rsync |
| Published | Aug 13, 2026 |
| Last Updated | Aug 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
RsyncProject / rsync
0 ≤ 3.4.4
References
Credits
gregkh