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CVE-2026-34221

Mikro-orm Mikroorm vulnerability

9.1 CRITICALEPSS 0.51%
  1. Published31 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Mikro-orm Mikroorm≥ 7.0.0 < 7.0.6 · < 6.6.10

Remediation

Fixed in
Mikro-orm Mikroorm≥ 7.0.6

References

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Frequently asked

Is CVE-2026-34221 being actively exploited?

CVE-2026-34221 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.51%.

How severe is CVE-2026-34221?

CVE-2026-34221 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2026-34221?

Affected products include Mikro-orm Mikroorm.

How do I fix CVE-2026-34221?

Upgrade affected software to a fixed version, for example Mikro-orm Mikroorm 7.0.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34221 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.