CVE-2026-77063

01/תיאור (מקור, אנגלית)

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.

02/מוצרים מושפעים

expressjs: multer

03/קישורים2

• cna.openjsf.org/security-advisories.html Vendor Advisory
• github.com/expressjs/multer/security/advisories/GHSA-qvfw-j98x‮… Vendor AdvisoryMitigation