CVE-2026-42077 MEDIUM

CVE-2026-42077: Evolver: Prototype Pollution via `Object.assign()` in mailbox store operations

Vendor Evomap
Product evolver
Weakness CWE-1321
Published May 4, 2026
Last update May 6, 2026

CVSS base score

5.2/10
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H

What the vulnerability does

01Description

Evolver is a GEP-powered self-evolving engine for AI agents. Prior to version 1.69.3, a prototype pollution vulnerability in the mailbox store module allows attackers to modify the behavior of all JavaScript objects by injecting malicious properties into Object.prototype. The vulnerability exists in the _applyUpdate() and _updateRecord() functions which use Object.assign() to merge user-controlled data without filtering dangerous keys like __proto__, constructor, or prototype. This issue has been patched in version 1.69.3.

Key dates

02Disclosure timeline

May 4, 2026 CVE published
May 6, 2026 Record updated