---
cve: "CVE-2026-34221"
severity: "HIGH"
cvss: 8.3
epss: "38%"
vendor: "mikro-orm"
kev: false
exploited: false
published: "2026-03-31 16:16:32"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T03:06:37+02:00"
---

# CVE-2026-34221

> 8.3 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a55e6f21abf0f8c5a7d7d49b5c3b78498023fc7b (Commit)
- 9a855e0f55d16f42761e9a0d05040643be5867f6 (Commit)

## Referenzen

- <https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34221) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_