CVE-2026-3304

Multer vulnerable to Denial of Service via incomplete cleanup

CVSS 4.0 8.7 HIGHEUVD CVSS 4.0 8.7 CVSS 4.0 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary 8.7 HIGHCVSS 3.1 · [email protected] · Primary 7.5 HIGHCVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary 7.5 HIGHCVSS_V4 Publisher rating HIGHFixed by multer 2.1.0KEV status unknown

Original advisory

cve-program · CVE-2026-3304

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-9033

Published

Read the publisher's advisory

nvd · CVE-2026-3304

Published

Read the publisher's advisory

osv · GHSA-xf7r-hgr6-v32p

Published

### Impact A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. ### Patches Users should upgrade to `2.1.0` ### Workarounds None

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-3304

Published

multer

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/multer",
                    "product": "multer",
                    "vendor": "expressjs",
                    "versions": [
                        {
                            "lessThan": "2.1.0",
                            "status": "affected",
                            "version": "0.0.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-9033

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Feb 27, 2026, 3:44:37 PM

dateUpdated: Jul 15, 2026, 1:07:21 AM

4 related source bulletins · separate from aliases

WID-SEC-W-2026-0903: IBM App Connect Enterprise: Mehrere Schwachstellen ermöglichen Denial of Service

CVE-2026-2359 · CVE-2026-3304 · CVE-2026-3520

RHSA-2026:6802: Red Hat Security Advisory: Red Hat Developer Hub 1.9.3 release.

CVE-2025-61140 · CVE-2025-69873 · CVE-2026-1615 · CVE-2026-2359 · CVE-2026-3304 · CVE-2026-3520 · CVE-2026-24046 · CVE-2026-25153 · CVE-2026-25639 · CVE-2026-25679 · CVE-2026-25896 · CVE-2026-26278 · CVE-2026-27606 · CVE-2026-27942 · CVE-2026-33186

RHSA-2026:6174: Red Hat Security Advisory: Red Hat Developer Hub 1.8.5 release.

CVE-2025-61140 · CVE-2026-2359 · CVE-2026-3304 · CVE-2026-3520 · CVE-2026-24046 · CVE-2026-25153 · CVE-2026-25639 · CVE-2026-25896 · CVE-2026-26278 · CVE-2026-27606 · CVE-2026-27942 · CVE-2026-33186

WID-SEC-W-2026-2394: HCL BigFix (Service Management): Mehrere Schwachstellen ermöglichen Denial of Service

CVE-2026-2359 · CVE-2026-27904 · CVE-2026-3304

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-3304

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: CWE-459

Original publisher date fields

published: 2026-02-27T16:16:26.380

lastModified: 2026-07-15T02:20:59.280

1 source CPE criteria · context only

cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-xf7r-hgr6-v32p

Published

multer

npm

SEMVER · introduced 0 → fixed 2.1.0

Original source record · Cite this exact observation · Complete original publisher JSON