High severity · published May 19, 2025
CVE-2025-47944
Multer vulnerable to Denial of Service from maliciously crafted requests
7.5
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
multer · expressjs
>=1.4.4-lts.1, <2.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47944
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-47944
github.com
https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665
github.com
https://github.com/expressjs/multer/issues/1176
github.com
https://github.com/expressjs/multer/security/advisories/GHSA-4pg4-qvpc-4q3h
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