What’s Vulnerable › Vulnerabilities

CVE-2026-70452: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-10-24
• Weakness: CWE-636

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.

Affected products

• RsyncProject rsync: from 3.1.0 through 3.4.4

References

• https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• https://github.com/RsyncProject/rsync/security/advisories/GHSA-6692-28cx-wpqq
• https://www.vulncheck.com/advisories/rsync-access-control-bypass-via-dns-resolution-failure

Get alerted when CVE-2026-70452 or the next vulnerability affects your stack