CVE-2026-34221 in mikro-orm MikroORMinfo

Summary

MikroORM is a TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Prior to versions 6.6.10 and 7.0.6, a prototype pollution vulnerability exists in the Utils.merge helper used internally by MikroORM when merging object structures. The function did not prevent special keys such as __proto__, constructor, or prototype, allowing attacker-controlled input to modify the JavaScript object prototype when merged. This issue has been patched in versions 6.6.10 and 7.0.6.

Responsible

GitHub_M

Reservation

03/26/2026

Disclosure

03/31/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
354438	mikro-orm MikroORM Javascript Object prototype pollution	1321	Not defined	Official fix	CVE-2026-34221

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