Vulnerability DatabaseCVE-2026-33864
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CVE-2026-33864
Published:March 26, 2026
Updated:August 27, 2026
A prototype pollution vulnerability exists in the latest version of the convict npm package (6.2.4). Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input started with a forbidden key, it is still possible to pollute "Object.prototype" via a crafted input using "String.prototype".
Affected Packages
convict (NPM):
Affected version(s) >=0.0.1 <6.2.5
Fix Suggestion:
Update to version 6.2.5
Related Resources (3)
https://github.com/mozilla/node-convict/blob/master/packages/convict/src/main.js
https://github.com/mozilla/node-convict/security/advisories/GHSA-44fc-8fm5-q62h
https://github.com/mozilla/node-convict
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CVSS v4
Base Score:
9.4
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-1321
EPSS
Base Score:
0.84