CVE-2026-70454

High

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.

SeverityHigh

CVSS8.0

Exploit probability—

ProductRsync

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-295CWE-295

How to fix

Vendor advisories

github.com/RsyncProject/rsync/security/advisories/GHSA-3c3x-ww2w-5r5p
github.com/RsyncProject/rsync/releases/tag/v3.5.0

Affected products

Product	Affected versions	Fixed in
RsyncProject rsync	v ≤ 3.4.4	—

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