{"id":"CVE-2026-88932","summary":"multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads","details":"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.","aliases":["GHSA-3pph-fpjx-jg34"],"modified":"2026-09-16T03:30:31.083231156Z","published":"2026-09-14T08:46:12.896Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"2.2.0"},{"fixed":"2.4.0"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"openjs","cwe_ids":["CWE-400","CWE-459"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88932.json"},"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88932.json"},{"type":"ADVISORY","url":"https://github.com/expressjs/multer/security/advisories/GHSA-3pph-fpjx-jg34"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88932"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/expressjs/multer","events":[{"introduced":"2e2af08157c66cbbc76539ccbd8869097a0c8feb"},{"fixed":"4e8edf50dbb5ddec213b6253642cbc08ce0225a7"}],"database_specific":{"source":"DESCRIPTION","extracted_events":[{"introduced":"2.2.0"},{"fixed":"2.3.0"}]}}],"versions":["v2.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88932.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}