copier-org copier up to 9.9.0 pathlib.Path path traversal

Summaryinfo

A vulnerability classified as critical has been found in copier-org copier up to 9.9.0. The impacted element is an unknown function in the library pathlib.Path. The manipulation leads to path traversal. This vulnerability is traded as CVE-2025-55201. An attack has to be approached locally. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in copier-org copier up to 9.9.0 and classified as critical. This issue affects some unknown processing in the library pathlib.Path. 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, integrity, and availability. The summary by CVE is:

Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read and write arbitrary files because Copier exposes a few pathlib.Path objects in the Jinja context which have unconstrained I/O methods. This effectively renders the security model w.r.t. filesystem access useless. This vulnerability is fixed in 9.9.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-55201 since 08/08/2025. The exploitation is known to be easy. Attacking locally is a requirement. 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 9.9.1 eliminates this vulnerability.

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Productinfo

Vendor

• copier-org

Name

• copier

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9.0

Website

• Product: https://github.com/copier-org/copier/

CPE 2.3info

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CPE 2.2info

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