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.

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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

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Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

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cve-program · CVE-2026-3304

Published

Multer vulnerable to Denial of Service via incomplete cleanup

Source published: 27 Feb 2026 15:44:37 UTC
Source modified: 15 Jul 2026 01:07:21 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 8.7 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

euvd · EUVD-2026-9033

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 exhausti…

Additional publisher context

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

Source published: Feb 27, 2026, 3:44:37 PM (timezone not stated)
Source modified: Jul 15, 2026, 1:07:21 AM (timezone not stated)
Saved here: 15 Nov 2026 09:37:14 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 8.7 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

nvd · 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 exhausti…

Additional publisher context

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.

Source published: 27 Feb 2026 16:16:26 UTC
Source modified: 15 Jul 2026 02:20:59 UTC
Saved here: 25 Oct 2026 08:17:18 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary · 8.7 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

CVSS 3.1 · [email protected] · Primary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv · GHSA-xf7r-hgr6-v32p

Published

Multer vulnerable to Denial of Service via incomplete cleanup

Source published: 1 Mar 2026 01:18:50 UTC
Source modified: 10 Sep 2026 03:51:00 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V4 · 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

Publisher rating · HIGH