{"id":"CVE-2026-3520","aliases":["GHSA-5528-5vmv-3xc2"],"url":"https://o3.security/vulnerability/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.","published":"2026-03-04T16:17:18.962Z","modified":"2026-07-16T03:48:29.149680261Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"multer","fixedVersion":"2.1.1"}],"fix":{"url":"https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752","label":"expressjs/multer@7e66481"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:48:29.149680261Z"}}