CVE-2026-34221
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
- Mikroorm
- Mikro-orm Mikroorm
- < 6.6.10, 7.0.6
- Fix
- Available
- CVSS 3.1
- 9.1 CRITICAL
- EPSS
- 0.4% (30th percentile)
- Weakness
- CWE-1321
- NVD status
- Analyzed
- Published
- 2026-03-31
CVE-2026-34221 at NVD
No indexed exploits for CVE-2026-34221 yet
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No exploit for CVE-2026-34221 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.