CVE-2026-70452
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
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.
Risk Assessment
An attacker can gain unauthorized access to files that should be protected by deny rules, potentially leading to data leakage or system integrity compromise.
Recommendation
It is recommended to upgrade rsync to version 3.5.0 or later, which includes the fix. Additionally, configure firewall rules and monitor for unauthorized access attempts.
Original NVD description (English source)
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.