CVE-2026-70452
9.1
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | 3.1.0 <= 3.4.4 | affected |
| RsyncProject | rsync | 3.5.0 | unaffected |
Weaknesses
- CWE-863: CWE-863 Incorrect Authorization
- CWE-636: CWE-636 Not Failing Securely ('Failing Open')
References
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-6692-28cx-wpqq
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
- https://www.vulncheck.com/advisories/rsync-access-control-bypass-via-dns-resolution-failure
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