RsyncProject Rsync up to 3.4.4 Chroot chdir path traversal

Summaryinfo

A vulnerability has been found in RsyncProject Rsync up to 3.4.4 and classified as problematic. This affects the function chdir of the component Chroot. The manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2026-53784. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in RsyncProject Rsync up to 3.4.4. This issue affects the function chdir of the component Chroot. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is:

rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink. The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-53784 since 06/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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

Website

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

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