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NVD description
multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 Low-severity security fix in multer@2.3.0 just released! Patches CVE-2026-77063: multer vulnerable to file size limit bypass via async fileFilter race condition https://github.com/expressjs/multer/security/advisories/GHSA-qvfw-j98x-7q72
Post summary
A low‑severity bug (CVE-2026-77063) affecting multer’s file size limit check has been fixed in version 2.3.0, addressing a race condition that could be abused for file size bypass.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | expressjs | multer | - | node.js | - |