Bug 2525771 (CVE-2026-77078) - CVE-2026-77078 multer: Multer: Denial of Service via crafted multipart field names
Summary: CVE-2026-77078 multer: Multer: Denial of Service via crafted multipart field ...
Keywords:
Status: NEW
Alias: CVE-2026-77078
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-28 22:01 UTC by OSIDB Bzimport
Modified: 2026-09-27 12:20 UTC (History)
22 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-08-28 22:01:20 UTC
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.


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