{"id":"CVE-2026-3520","summary":"Multer vulnerable to Denial of Service via uncontrolled recursion","details":"Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.","aliases":["GHSA-5528-5vmv-3xc2"],"modified":"2026-08-12T03:51:44.771148639Z","published":"2026-03-04T16:17:18.962Z","related":["CGA-432f-7mj6-gpqf"],"database_specific":{"cna_assigner":"openjs","cwe_ids":["CWE-674"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3520.json"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-3520"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6174"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6802"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-3520"},{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3520.json"},{"type":"ADVISORY","url":"https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3520"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2444584"},{"type":"FIX","url":"https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/expressjs/multer","events":[{"introduced":"0"},{"fixed":"368c8a10cca11854cf17c24029fefd1eafb1c059"},{"fixed":"7e66481f8b2e6c54b982b34c152479e096ce2752"}],"database_specific":{"cpe":"cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.1.1"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v2.1.0","v2.0.2","v2.0.1","v2.0.0","v1.4.5-lts.2","v1.4.5-lts.1","v1.4.4","v1.4.4-lts.1","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.1","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3520.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}