#VU111106 Uncaught Exception in multer - CVE-2025-47944

Vulnerability identifier: #VU111106

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-47944

CWE-ID: CWE-248

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
multer
Other software / Other software solutions

Vendor: Express.js

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can send a malformed multi-part upload request and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

multer: 1.4.4.1 - 1.4.5.2

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.