GHSA-wc9g-mqfw-jrwm
multer vulnerable to Denial of Service via crafted multipart field names
At a glance
- Published
- Updated
- CVE
- CVE-2026-77078
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
### Impact A vulnerability in multer allows a remote, unauthenticated attacker to crash the Node.js process with a single `multipart/form-data` request. Two specially crafted text field names cause an uncaught `RangeError: Invalid array length` inside multer's field parsing, which is not routed to the application error handler and terminates the process. All applications using multer to parse multipart requests are affected. ### Patches Users should upgrade to `2.3.0`. ### Workarounds None.
Affected packages
| Package | Versions |
|---|---|
| npm · multer | introduced 0, fixed 2.3.0 |
References
- https://github.com/expressjs/multer/security/advisories/GHSA-wc9g-mqfw-jrwm WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-77078 ADVISORY
- https://github.com/expressjs/multer/commit/87a584e8c8d4da873292635fa1d8c4d78d985b76 WEB
- https://cna.openjsf.org/security-advisories.html WEB
- https://github.com/expressjs/multer PACKAGE
- https://github.com/expressjs/multer/releases/tag/v2.3.0 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |