CVE-2026-34221
Critical · 9.1CVSS
9.1
EPSS
0.5%
Published
Mar 31, 2026
CISA due date
—
The record
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 | Introduced | Fixed |
|---|---|---|---|
| npm | @mikro-orm/core | 0 | 6.6.10 |
| npm | @mikro-orm/core | 7.0.0-dev.0 | 7.0.6 |
Related vulnerabilities
- GHSA-qpfv-44f3-qqx6 MikroORM has Prototype Pollution in Utils.merge Same vulnerability
- CVE-2026-34220 MikroORM is a TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity… Also affects @mikro-orm/core
- GHSA-gwhv-j974-6fxm MikroORM is vulnerable to SQL Injection via specially crafted object Also affects @mikro-orm/core
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