Vulnerability · Published May 4, 2026 · Assigned by GitHub_M

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

Medium 5.2

In plain English

A medium-severity prototype pollution in evolver from EvoMap. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.2Medium

Exploit odds (30 days)0.2%top 95.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@evomap/evolver	1.69.3	GHSA-2cjr-5v3h-v2w4

Affected products (as reported)

Vendor	Product	Versions
EvoMap	evolver	< 1.69.3

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H

References

https://github.com/EvoMap/evolver/security/advisories/GHSA-2cjr-5v3h-v2w4 x_refsource_CONFIRM
https://github.com/EvoMap/evolver/releases/tag/v1.69.3 x_refsource_MISC