CVEvulnerability

CVE-2026-77078

7.5 HIGH Published 2026-08-28 Modified 2026-09-02 Official page ↗
Status
Analyzed
Published
2026-08-28
Last modified
2026-09-02
Assigner
ce714d77-add3-4f53-aff5-83d477b104bb
CVSS 3.1 (ce714d77-add3-4f53-aff5-83d477b104bb)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-248

Description

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.

Affected configurations

• expressjs multer (< 2.3.0)

Related

Weakness · CWE (1)

  • CWE-248 Uncaught Exception weakness

References