p PatchFirst

CVE-2026-34221

CVE-2026-34221 · MikroORM has Prototype Pollution in Utils.merge

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.3 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • mikro-orm

    Versions
    • < 6.6.10: Affected
    • >= 7.0.0-rc.0, < 7.0.6: Affected

    No fix published

  • @mikro-orm/core npm

    Affected ranges
    • SEMVER: < 6.6.10

    Update to 6.6.10

  • @mikro-orm/core npm

    Affected ranges
    • SEMVER: ≥ 7.0.0-dev.0, < 7.0.6

    Update to 7.0.6

Original sources

Check your server →