{"id":"CVE-2026-34221","state":"PUBLISHED","title":"MikroORM has Prototype Pollution in Utils.merge","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.","publishedAt":"2026-03-31T15:17:45.286Z","updatedAt":"2026-03-31T18:52:43.939Z","severity":{"score":8.3,"label":"High","version":"4.0","vector":"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":"GitHub_M"},"assigner":"GitHub_M","products":["mikro-orm mikro-orm"],"affected":[{"vendor":"mikro-orm","product":"mikro-orm","versions":[{"version":"< 6.6.10","status":"affected"},{"version":">= 7.0.0-rc.0, < 7.0.6","status":"affected"}]}],"references":["https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6"],"weaknesses":["CWE-1321"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/34xxx/CVE-2026-34221.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34221","state":"PUBLISHED","datePublished":"2026-03-31T15:17:45.286Z","dateUpdated":"2026-03-31T18:52:43.939Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-26T15:57:52.324Z"},"containers":{"cna":{"title":"MikroORM has Prototype Pollution in Utils.merge","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"mikro-orm","product":"mikro-orm","versions":[{"version":"< 6.6.10","status":"affected"},{"version":">= 7.0.0-rc.0, < 7.0.6","status":"affected"}]}],"references":[{"url":"https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6","name":"https://github.com/mikro-orm/mikro-orm/security/advisories/GHSA-qpfv-44f3-qqx6","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"LOW","baseScore":8.3,"baseSeverity":"HIGH","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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-31T15:17:45.286Z"},"source":{"advisory":"GHSA-qpfv-44f3-qqx6","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T18:50:17.961219Z","id":"CVE-2026-34221","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-31T18:52:43.939Z"}}]}}}