🛡️ CVE-2026-34221
🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-1321 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CWE CWE-1321
Public Exploit ✅ No
Source NVD
Published 2026-03-29
Updated 2026-06-02
Modified 2026-03-31
Fix URL N/A

Affected Packages

Software From version Fixed in
@mikro-orm/core — —
mikroorm 7.0.0 7.0.6

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