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CVE PROGRAM SOURCE RECORD8.3 High

CVE-2026-34221

MikroORM has Prototype Pollution in Utils.merge

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

mikro-orm mikro-orm

  • < 6.6.10affected
  • >= 7.0.0-rc.0, < 7.0.6affected

References