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.

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History

Thu, 13 Aug 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
Weaknesses CWE-636
CWE-863
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.1, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-13T14:46:50.541Z

Reserved: 2026-08-04T14:52:23.814Z

Link: CVE-2026-70452

cve-icon Vulnrichment

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cve-icon NVD

Status : Received

Published: 2026-08-13T15:19:58.740

Modified: 2026-08-13T15:19:58.740

Link: CVE-2026-70452

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses