conda constructor up to 3.12.x authentication by alternate name

Summaryinfo

A vulnerability labeled as problematic has been found in conda constructor up to 3.12.x. This vulnerability affects unknown code. The manipulation results in authentication by alternate name. This vulnerability was named CVE-2025-64343. The attack needs to be approached locally. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in conda constructor up to 3.12.x. Affected is an unknown part. The manipulation with an unknown input leads to a authentication by alternate name vulnerability. CWE is classifying the issue as CWE-289. The product performs authentication based on the name of a resource being accessed, or the name of the actor performing the access, but it does not properly check all possible names for that resource or actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

(conda) Constructor is a tool that enables users to create installers for conda package collections. In versions 3.12.2 and below, the installation directory inherits permissions from its parent directory. Outside of restricted directories, the permissions are very permissive and often allow write access by authenticated users. Any logged in user can make modifications during the installation for both single-user and all-user installations. This constitutes a local attack vector if the installation is in a directory local users have access to. For single-user installations in a shared directory, these permissions persist after the installation. This issue is fixed in version 3.13.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-64343 since 10/30/2025. The exploitability is told to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

Upgrading to version 3.13.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c368383710a7c2b81ad1b0ecb9724b38d3577447 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• conda

Name

• constructor

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12

License

• open-source

Website

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

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