Conda up to 26.5.1 Python Entry Point python.py parse_entry_point_def path traversal

Summaryinfo

A vulnerability described as critical has been identified in Conda up to 26.5.1. Affected is the function parse_entry_point_def of the file conda/common/path/python.py of the component Python Entry Point. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-53940. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Conda up to 26.5.1 and classified as critical. This vulnerability affects the function parse_entry_point_def of the file conda/common/path/python.py of the component Python Entry Point. The manipulation 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. CVE summarizes:

Conda is a system-level binary package and environment manager that runs on major operating systems and platforms. Prior to 26.5.2, parse_entry_point_def in conda/common/path/python.py accepted an unvalidated entry-point command from a noarch:python package's info/link.json metadata. CreatePythonEntryPointAction in conda/core/path_actions.py interpolated that command into target_short_path, and PrefixPathAction.target_full_path joined it to the installation prefix without verifying that the result remained under the intended bin or Scripts directory. create_python_entry_point in conda/gateways/disk/create.py then wrote an executable wrapper to the resulting path. A malicious package could use path separators, traversal segments, or an absolute command path to write outside the prefix or overwrite another in-prefix entry point during default install and environment transactions. Out-of-prefix writes require the target parent directory to exist, while an overwritten entry point can execute attacker-controlled Python when later invoked with the installing user's privileges. This issue is fixed in version 26.5.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-53940 since 06/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 26.5.2 eliminates this vulnerability.

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Productinfo

Name

• Conda

Version

• 26.5.0
• 26.5.1

Website

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

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