CVE-2026-70452: samba rsync

CVSS 9.1 (critical) · published 2026-08-13

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 (NVD): samba rsync

Fixed in (NVD): 3.5.0

Weakness: CWE-636, CWE-863

Source: NVD CVE-2026-70452

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

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