Vulnerability · Published May 19, 2025 · Assigned by GitHub_M

CVE-2025-47944Multer vulnerable to Denial of Service from maliciously crafted requests

High 7.5

In plain English

A high-severity security flaw in multer from expressjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.8%top 42.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 2.0.0 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 2.0.0 to receive a patch. No known workarounds are available.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	multer	2.0.0	GHSA-4pg4-qvpc-4q3h

Affected products (as reported)

Vendor	Product	Versions
expressjs	multer	>=1.4.4-lts.1, <2.0.0

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/expressjs/multer/security/advisories/GHSA-4pg4-qvpc-4q3h x_refsource_CONFIRM
https://github.com/expressjs/multer/issues/1176 x_refsource_MISC
https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665 x_refsource_MISC