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OpenAdvisories
High · 7.5 Public exploit CVE-2025-7338 EUVD-2025-21776GHSA-fjgf-rc76-4x9p

Multer vulnerable to Denial of Service via unhandled exception from malformed request

Published Jul 17, 2025 · Updated Jul 17, 2025 · Assigned by openjs

Vendor: expressjs Product: multer Package: multer Ecosystem: npm

Description

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.

Affected products

VendorProductAffectedFixed
expressjs multer 1.4.4-lts.1 – < 2.0.2 2.0.2

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
npm multer >= 1.4.4-lts.1, < 2.0.2 2.0.2 GHSA-fjgf-rc76-4x9p

Advisories 3

References