CVE-2026-42077
Medium
Description
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.
SeverityMedium
CVSS5.2
Exploit probability—
Product@evomap/evolver
PublishedMay 4, 2026
First seenMay 4, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- @evomap/evolver1.69.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @evomap/evolvernpm | v < 1.69.3 | 1.69.3 |
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