CVE-2025-64343

Local file tampering via inherited installer permissions

Published Nov 7, 2025 · Updated Nov 7, 2025

Improper permissions in Conda Constructor before 3.13.0 allow local users to modify files installed by generated Windows EXE installers. The Windows NSIS template creates $INSTDIR with inherited parent ACLs and begins extracting files before revoking write access from authenticated users. A local user needs write access to the chosen parent directory; tampering is temporary for all-user installs but persists after single-user installs in shared directories.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permissions in Conda Constructor before 3.13.0 allow local users to modify files installed by generated Windows EXE installers. The Windows NSIS template creates $INSTDIR with inherited parent ACLs and begins extracting files before revoking write access from authenticated users. A local user needs write access to the chosen parent directory; tampering is temporary for all-user installs but persists after single-user installs in shared directories.

The record

CVE
CVE-2025-64343
Published
Nov 7, 2025
Updated
Nov 7, 2025
Vendor
Conda
Product
Constructor
Classifications
CWE-289
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.13.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Conda · Constructorversion=< 3.13.0

Published CVSS scores

7.8GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-289Authentication Bypass by Alternate Name

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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