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CVE-2026-34221

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:35ee30500b9aa841c0476fa9b27ecbd42f28124d64f77685e239cf1165445a4b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"mikro-orm","vendor":"mikro-orm","versions":[{"status":"affected","version":"< 6.6.10"},{"status":"affected","version":">= 7.0.0-rc.0, < 7.0.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0a45beedf68d5197c8ce857a38e3b91f8072f74fc645d7a6c4be057c0759e094 · sha256:e488d7ee40f53ce8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0a45beedf68d5197c8ce857a38e3b91f8072f74fc645d7a6c4be057c0759e094 · sha256:e488d7ee40f53ce8… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0a45beedf68d5197c8ce857a38e3b91f8072f74fc645d7a6c4be057c0759e094 · sha256:e488d7ee40f53ce8… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0a45beedf68d5197c8ce857a38e3b91f8072f74fc645d7a6c4be057c0759e094 · sha256:e488d7ee40f53ce8… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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