expressjs multer up to 2.0.x release of resource

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k1.17

Summaryinfo

A vulnerability marked as problematic has been reported in expressjs multer up to 2.0.x. Impacted is an unknown function. Performing a manipulation results in release of resource. This vulnerability is reported as CVE-2026-2359. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in expressjs multer up to 2.0.x. This affects an unknown code. The manipulation with an unknown input leads to a release of resource vulnerability. CWE is classifying the issue as CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. This is going to have an impact on availability. The summary by CVE is:

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 dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-2359 since 02/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 2.1.0 eliminates this vulnerability. Applying the patch cccf0fe0e64150c4f42ccf6654165c0d66b9adab 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). Statistical analysis made it clear that VulDB provides the best quality 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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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Release of resource
CWE: CWE-772 / CWE-400 / CWE-404
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: cccf0fe0e64150c4f42ccf6654165c0d66b9adab

Timelineinfo

02/11/2026 CVE reserved
02/27/2026 +16 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-v52c-386h-88mc
Status: Confirmed

CVE: CVE-2026-2359 (🔒)
GCVE (CVE): GCVE-0-2026-2359
GCVE (VulDB): GCVE-100-348177
CERT Bund: WID-SEC-2026-0903 - IBM App Connect Enterprise: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 02/27/2026 18:13
Updated: 03/31/2026 02:19
Changes: 02/27/2026 18:13 (68), 03/19/2026 23:07 (12), 03/31/2026 02:19 (7)
Complete: 🔍
Cache ID: 216:9E3:103

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