{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8161","assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","state":"PUBLISHED","assignerShortName":"openjs","dateReserved":"2026-05-08T10:38:20.438Z","datePublished":"2026-05-12T08:50:37.685Z","dateUpdated":"2026-05-12T12:32:10.127Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","shortName":"openjs","dateUpdated":"2026-05-12T08:50:37.685Z"},"title":"multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-248","description":"CWE-248: Uncaught Exception","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"affected":[{"vendor":"multiparty","product":"multiparty","versions":[{"status":"affected","version":"0","lessThanOrEqual":"4.2.3","versionType":"semver"},{"status":"unaffected","version":"4.3.0","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/multiparty"}],"descriptions":[{"lang":"en","value":"multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.","supportingMedia":[{"type":"text/html","base64":false,"value":"multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher."}]}],"references":[{"url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956"},{"url":"https://cna.openjsf.org/security-advisories.html"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}],"credits":[{"lang":"en","value":"Ser0n-ath","type":"reporter"},{"lang":"en","value":"Sebastian Beltran","type":"remediation developer"},{"lang":"en","value":"kq5y","type":"finder"},{"lang":"en","value":"Byambadalai Sumiya","type":"finder"},{"lang":"en","value":"Blake Embrey","type":"remediation reviewer"},{"lang":"en","value":"Ulises Gascón","type":"remediation reviewer"}],"x_generator":{"engine":"cve-kit 1.0.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-12T12:31:39.867190Z","id":"CVE-2026-8161","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-12T12:32:10.127Z"}}]}}