Review reviewHigh

CVE-2026-3520

expressjs multer, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

CVSS: 8.7
EPSS: 0.71%
CISA KEV: Not listed
Published: 2026.03.05

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.71%

Technical severityCVSS 8.7

Vulnerability overview

Affected product and versions

Product: expressjs multer, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9
Affected versions: < 2.1.1
Fixed versions: 2.1.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that expressjs multer, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: 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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-674, CWE-770