{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8159","assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","state":"PUBLISHED","assignerShortName":"openjs","dateReserved":"2026-05-08T09:45:28.532Z","datePublished":"2026-05-12T08:35:39.564Z","dateUpdated":"2026-05-12T12:33:59.418Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","shortName":"openjs","dateUpdated":"2026-05-12T08:35:39.564Z"},"title":"multiparty vulnerable to ReDoS via filename parsing","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","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 regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. 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 regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher."}]}],"references":[{"url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94"},{"url":"https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS"},{"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":"aszx87410","type":"finder"},{"lang":"en","value":"Blake Embrey","type":"remediation developer"},{"lang":"en","value":"Ulises Gascón","type":"remediation reviewer"}],"x_generator":{"engine":"cve-kit 1.0.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-12T12:33:48.310208Z","id":"CVE-2026-8159","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":"2026-05-12T12:33:59.418Z"}}]}}