CVE-2025-64343: (conda) Constructor: Excessive permissions during and after installation

Vulnerability summary

CVE-2025-64343 is a high (CVSS 7.8) Authentication Bypass by Alternate Name vulnerability in conda constructor. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Timeline

1. 07-11-2025
   PublishedVulnerability first disclosed.
2. 07-11-2025
   Last modifiedVulnerability information updated.

Description

(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.

• CWE-289Authentication Bypass by Alternate NameThe 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.