CVE-2025-64343: conda constructor · Authentication Bypass by Alternate Name
Affects conda constructorSource CVE Database V5
Not known to be exploited · CVSS 7.8 High : upgrade to 3.13.0 soon.
Data as of 26 Oct 2026, 06:26 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.13.0
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 7 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Upgrade conda/constructor to 3.13.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubconda/constructorpkg:github/conda/constructorOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
The primary mitigation is to upgrade conda constructor to version 3.13.0 or later, where the permission inheritance issue is fixed. Organizations should audit existing installations to verify directory permissions and restrict write access to installation directories to trusted administrators only. Avoid installing conda packages in shared directories accessible by multiple users unless strict access controls are enforced. Implement file system ACLs or POSIX permissions to limit write permissions to authorized users. Regularly monitor and audit file integrity in installation directories to detect unauthorized changes. Employ endpoint protection solutions that can detect anomalous modifications to software installations. Educate users about the risks of installing software in shared locations and enforce policies that restrict local user write access. For environments where upgrading is not immediately possible, consider isolating affected systems or using containerization to limit the impact of potential exploitation.
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.