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CVE-2026-77078

multer vulnerable to Denial of Service via crafted multipart field names PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
multer / multeraffected 0 before 2.3.0; unaffected 2.3.0

CWE

CWE-248

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.