CVE-2026-70452

rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure

Published: Aug 13, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-636

7.4HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-636 CWE-863

Affected Products

RsyncProject

oss-projectaka rsync, rsync project

rsyncLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0

github.com

https://github.com/RsyncProject/rsync/security/advisories/GHSA-6692-28cx-wpqq

github.com

https://www.vulncheck.com/advisories/rsync-access-control-bypass-via-dns-resolution-failure

vulncheck.com

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