rclone up to 1.74.3 Backend Object Key Construction path path traversal

Summaryinfo

A vulnerability was found in rclone up to 1.74.3. It has been declared as critical. This affects an unknown part of the component Backend Object Key Construction. Executing a manipulation of the argument path can lead to path traversal. The identification of this vulnerability is CVE-2026-59733. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in rclone up to 1.74.3 and classified as critical. This vulnerability affects some unknown processing of the component Backend Object Key Construction. The manipulation of the argument path with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, rclone serve restic --private-repos enforces authorization using the routed user path segment while building the backend object key from the raw uncleaned URL path, allowing an authenticated user to include .. in a request such as //..//config and read, overwrite, or delete another user's private repository on backends that clean path components. This issue is fixed in version 1.74.4.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-59733 since 07/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.74.4 eliminates this vulnerability.

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Productinfo

Name

• rclone

Version

• 1.74.0
• 1.74.1
• 1.74.2
• 1.74.3

Website

• Product: https://github.com/rclone/rclone/

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