What is CVE-2026-42077?

CVE-2026-42077 is a medium-severity vulnerability in Evomap Evolver, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.2/10. Published 2026-05-04.

How severe is CVE-2026-42077?

Medium severity. CVSS v3 base score is 5.2 out of 10.

Prototype Pollution in Evomap Evolver

CVE-2026-42077

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…

Vulnerability class: Prototype Pollution

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H.

Affected products

Evomap Evolver — versions < 1.69.3

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

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

Frequently asked questions

What is CVE-2026-42077?: CVE-2026-42077 is a medium-severity vulnerability in Evomap Evolver, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.2/10. Published 2026-05-04.
How severe is CVE-2026-42077?: Medium severity. CVSS v3 base score is 5.2 out of 10.