PT-2026-28612 · Npm · @Mikro-Orm/Core

Published 2026-03-29 · Updated 2026-03-29 · CVE-2026-34221

OSV

CVSS v4.0

8.3

High

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:L/SA:L

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.

Exploitation requires application code to pass untrusted user input into ORM operations that merge object structures, such as entity property assignment or query condition construction.

Prototype pollution may lead to denial of service or unexpected application behavior. In certain scenarios, polluted properties may influence query construction and potentially result in SQL injection depending on application code.

Fix

Prototype Pollution

Weakness Enumeration

CWE-1321

Related Identifiers

CVE-2026-34221

GHSA-QPFV-44F3-QQX6

Affected Products

@Mikro-Orm/Core

References · 3

• https://osv.dev/vulnerability/GHSA-qpfv-44f3-qqx6 · Vendor Advisory
• https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6 · Note
• https://github.com/mikro-orm/mikro-orm · Note