Medium [CVE-2026-70454] TLS Certificate Validation Bypass allows interception of encrypted sessions
This medium-severity Red Hat Linux advisory covers CVE-2026-70454 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4.
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Summary
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. A flaw was found in the rsync-ssl wrapper script's TLS certificate validation.
The vulnerability arises from insufficient TLS certificate validation, enabling an attacker to present invalid certificates and compromise data integrity and confidentiality without detection. Exploitation requires an attacker to be positioned to intercept network traffic between the rsync client and server.
Red Hat severity: Moderate — CVSS 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N). Weakness: CWE-295.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462.
Affected products named by the advisory: Red Hat package: rsync.
- 3.2.0
- 3.2.3
- 3.4.4
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- 3.5.0
- rsync-0:3.5.0-3.el10_2
- rsync-0:3.2.7-1.el9_8
- RHSA-2026:67463
- RHSA-2026:67462
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- Do not use rsync-ssl with the openssl or stunnel backends. Use rsync over SSH, which authenticates the host and encrypts the session: rsync -avz -e ssh /source user@remote:/destination. If daemon TLS cannot be avoided, restrict those sessions to trusted networks
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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