RsyncProject Rsync up to 3.4.9 Rename Confinement Logic temp-dir/link-dest path traversal

Summaryinfo

A vulnerability has been found in RsyncProject Rsync up to 3.4.9 and classified as critical. Impacted is an unknown function of the component Rename Confinement Logic. This manipulation of the argument temp-dir/link-dest causes path traversal. This vulnerability is handled as CVE-2026-53795. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in RsyncProject Rsync up to 3.4.9. It has been declared as critical. Affected by this vulnerability is an unknown part of the component Rename Confinement Logic. The manipulation of the argument temp-dir/link-dest with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

rsync before 3.5.0 contains an arbitrary file write vulnerability that allows attackers to write files outside the intended destination tree by specifying an absolute path via --temp-dir or --link-dest options. The rename-confinement logic is bypassed when these options resolve to paths outside the destination tree, enabling attacker-controlled values to write files to arbitrary locations accessible to the rsync process.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-53795 since 06/10/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

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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