CVE-2026-34221
MikroORM has Prototype Pollution in Utils.merge
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1321 |
| Vendor | mikro-orm |
| Product | mikro-orm |
| Published | Mar 31, 2026 |
| Last Updated | Mar 31, 2026 |
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Affected Versions
mikro-orm / mikro-orm
< 6.6.10 >= 7.0.0-rc.0, < 7.0.6