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NVD description
rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation. When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthorized access to restricted module file trees.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
One of the rsync requirements looked almost embarrassingly simple. A host matching hosts deny must not be admitted. The check failed. When a hostname in a deny rule could not be resolved, rsync skipped the rule. Under that config it failed open. That became CVE-2026-70452, rated HIGH.