critical9.1
CVE-2026-34221
MikroORM is a TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @mikro-orm/core | < 6.6.10 | 6.6.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mikro-Orm | Mikroorm | before 6.6.10 from 7.0.0 before 7.0.6 |