RsyncProject Rsync up to 3.4.9 Auth Users Parser authorization

Summaryinfo

A vulnerability identified as critical has been detected in RsyncProject Rsync up to 3.4.9. This impacts an unknown function of the component Auth Users Parser. This manipulation causes authorization. The identification of this vulnerability is CVE-2026-70463. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in RsyncProject Rsync up to 3.4.9. Affected by this vulnerability is some unknown functionality of the component Auth Users Parser. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing. The auth users parser uses comma-only tokenization when splitting the user list, which fails to correctly handle entries of the form @Group Name where the group name contains a space. The space within the group name causes the parser to split the entry at the space boundary, discarding the deny rule associated with the group. An authenticated user whose username or group membership would be denied by an @Group Name auth users entry can connect to a restricted module because the deny rule is silently discarded during parsing.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-70463 since 08/04/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 3.5.0 eliminates this vulnerability.

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Productinfo

Type

• File Transfer Software

Vendor

• RsyncProject

Name

• Rsync

Version

• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.4.8
• 3.4.9

Website

• Product: https://github.com/RsyncProject/rsync/

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