expressjs multer up to 2.0.x cleanup

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k1.12

Summaryinfo

A vulnerability described as problematic has been identified in expressjs multer up to 2.0.x. The affected element is an unknown function. Executing a manipulation can lead to cleanup. This vulnerability appears as CVE-2026-3304. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in expressjs multer up to 2.0.x and classified as problematic. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a cleanup vulnerability. The CWE definition for the vulnerability is CWE-459. The product does not properly "clean up" and remove temporary or supporting resources after they have been used. As an impact it is known to affect availability. CVE summarizes:

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

The advisory is available at github.com. This vulnerability was named CVE-2026-3304 since 02/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 2.1.0 eliminates this vulnerability. Applying the patch 739919097dde3921ec31b930e4b9025036fa74ee is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0903). Once again VulDB remains the best source for vulnerability data.

Affected

  • IBM App Connect Enterprise

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cleanup
CWE: CWE-459
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: multer 2.1.0
Patch: 739919097dde3921ec31b930e4b9025036fa74ee

Timelineinfo

02/26/2026 CVE reserved
02/27/2026 +1 days Advisory disclosed
02/27/2026 +0 days VulDB entry created
03/31/2026 +32 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-xf7r-hgr6-v32p
Status: Confirmed

CVE: CVE-2026-3304 (🔒)
GCVE (CVE): GCVE-0-2026-3304
GCVE (VulDB): GCVE-100-348178
CERT Bund: WID-SEC-2026-0903 - IBM App Connect Enterprise: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 02/27/2026 18:14
Updated: 03/31/2026 02:19
Changes: 02/27/2026 18:14 (68), 03/19/2026 23:07 (12), 03/31/2026 02:19 (7)
Complete: 🔍
Cache ID: 216:DFC:103

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