7.5

CVE-2026-77078

multer vulnerable to Denial of Service via crafted multipart field names

multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Expressjs ≫ Multer SwPlatform node.js Version < 2.3.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.212
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
ce714d77-add3-4f53-aff5-83d477b104bb 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-248 Uncaught Exception

An exception is thrown from a function, but it is not caught.

https://cna.openjsf.org/security-advisories.html
Vendor Advisory
https://github.com/expressjs/multer/security/advisories/GHSA-wc9g-mqfw-jrwm
Vendor Advisory