cvedb.io
CVE-2026-34221
CRITICAL · CVSS 9.1
EPSS exploitation probability: 0%
Published 2026-03-31T16:16:32.293 · Last modified 2026-06-17T10:38:40.843

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.

Affected products

mikro-orm — mikroorm

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.