{"id":"CVE-2026-88932","state":"PUBLISHED","title":"multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads","description":"multer is a Node.js middleware for handling multipart/form-data uploads. In versions 2.2.0 through 2.3.0, when a request using disk storage is aborted mid-upload, file writes that complete after multer has already run its abort cleanup are not removed, so each aborted upload can leave an orphaned file on disk. A remote unauthenticated attacker can repeatedly start and abort uploads to accumulate orphaned files and exhaust disk space, causing a denial of service. The issue is fixed in multer 2.4.0, and users should upgrade to 2.4.0 or later.","publishedAt":"2026-09-14T08:46:12.896Z","updatedAt":"2026-09-14T10:29:12.674Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"openjs"},"assigner":"openjs","products":["multer multer"],"affected":[{"vendor":"multer","product":"multer","packageURL":"pkg:npm/multer","defaultStatus":"unaffected","versions":[{"version":"2.2.0","status":"affected","lessThan":"2.4.0","versionType":"semver"},{"version":"2.4.0","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/expressjs/multer/security/advisories/GHSA-3pph-fpjx-jg34","https://cna.openjsf.org/security-advisories.html"],"weaknesses":["CWE-400","CWE-459"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/88xxx/CVE-2026-88932.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-88932","state":"PUBLISHED","datePublished":"2026-09-14T08:46:12.896Z","dateUpdated":"2026-09-14T10:29:12.674Z","assignerShortName":"openjs","assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","dateReserved":"2026-09-10T14:28:44.035Z"},"containers":{"cna":{"title":"multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads","descriptions":[{"lang":"en","value":"multer is a Node.js middleware for handling multipart/form-data uploads. In versions 2.2.0 through 2.3.0, when a request using disk storage is aborted mid-upload, file writes that complete after multer has already run its abort cleanup are not removed, so each aborted upload can leave an orphaned file on disk. A remote unauthenticated attacker can repeatedly start and abort uploads to accumulate orphaned files and exhaust disk space, causing a denial of service. The issue is fixed in multer 2.4.0, and users should upgrade to 2.4.0 or later."}],"affected":[{"vendor":"multer","product":"multer","packageURL":"pkg:npm/multer","defaultStatus":"unaffected","versions":[{"version":"2.2.0","status":"affected","lessThan":"2.4.0","versionType":"semver"},{"version":"2.4.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/expressjs/multer/security/advisories/GHSA-3pph-fpjx-jg34"},{"url":"https://cna.openjsf.org/security-advisories.html"}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM"},"scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-459","lang":"en","description":"CWE-459: Incomplete Cleanup","type":"CWE"}]}],"providerMetadata":{"shortName":"openjs","orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","dateUpdated":"2026-09-14T08:46:12.896Z"},"credits":[{"lang":"en","type":"reporter","value":"euriconicacio"},{"lang":"en","type":"remediation developer","value":"UlisesGascon"},{"lang":"en","type":"remediation reviewer","value":"bjohansebas"}],"x_generator":{"engine":"cve-kit 1.0.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T10:28:47.353955Z","id":"CVE-2026-88932","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T10:29:12.674Z"}}]}}}