{"id":"CVE-2026-113872","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-113872","summary":"multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown","details":"### Impact\n\nWhen `multer` is configured with an asynchronous `fileFilter`, a single request can crash the Node.js process. If a request is aborted (for example when one file is rejected) while another file's async `fileFilter` is still pending, the pending callback later resumes a parsing stream that multer has already torn down. busboy then emits an error on a stream that no longer has an error listener, which Node raises as an unhandled `'error'` event, and the process exits. A single unauthenticated request is enough, so any application using `multer` with an asynchronous `fileFilter` is affected, regardless of storage engine. Uploads using a synchronous `fileFilter` are not affected.\n\n### Patches\n\nUsers should upgrade to `multer` `2.5.0` or later.\n\n### Workarounds\n\nUse a synchronous `fileFilter`.","published":"2026-10-23T22:08:22Z","modified":"2026-10-23T22:15:04.285056362Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"multer","fixedVersion":"2.5.0"}],"fix":{"url":"https://github.com/expressjs/multer/commit/80a2d9df1dfd63b5fab631b8b9966164ed647adf","label":"expressjs/multer@80a2d9d"},"references":[{"type":"WEB","url":"https://github.com/expressjs/multer/security/advisories/GHSA-q7qp-rjg7-q26m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113872"},{"type":"WEB","url":"https://github.com/expressjs/multer/commit/80a2d9df1dfd63b5fab631b8b9966164ed647adf"},{"type":"WEB","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"PACKAGE","url":"https://github.com/expressjs/multer"},{"type":"WEB","url":"https://github.com/expressjs/multer/releases/tag/v2.5.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-23T22:15:04.285056362Z"}}