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

Quick assessment

Affected
mikro-orm mikro-orm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MikroORM是MikroORM开源的一个支持多数据库的类型安全对象关系映射框架。 MikroORM 6.6.10之前版本和7.0.6之前版本存在安全漏洞，该漏洞源于Utils.merge辅助函数未阻止特殊键，可能导致原型污染。

AI Predicted 7.5 Difficulty: Easy EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34221

Vulnerability Information
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Vulnerability Title
MikroORM has Prototype Pollution in Utils.merge
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
MikroORM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MikroORM是MikroORM开源的一个支持多数据库的类型安全对象关系映射框架。 MikroORM 6.6.10之前版本和7.0.6之前版本存在安全漏洞，该漏洞源于Utils.merge辅助函数未阻止特殊键，可能导致原型污染。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mikro-orm mikro-orm < 6.6.10 -

II. Public POCs for CVE-2026-34221

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III. Intelligence Information for CVE-2026-34221

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IV. Related Vulnerabilities

Same product: mikro-orm
Same vendor: mikro-orm
Same weakness: CWE-1321

V. Comments for CVE-2026-34221

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