CVE-2026-70454
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
- State
- Published
- Severity
- 7.6 High
- Published
- Aug 13, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.6 High | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.0 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
rsyncRsyncProject |
|
References
- GitHub Security Advisory (GHSA-3c3x-ww2w-5r5p)vendor-advisory
- rsync 3.5.0 Release Notesrelease-notes
- https://www.vulncheck.com/advisories/rsync-tls-certificate-validation-bypass-via-ssl-openssl-modethird-party-advisory
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