CVE-2026-3304

highpriority · track · 40EPSS 0.007 · 54 %ileexploit · PoCDEEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.74% (54th) EPSS

CVSS 7.5 · high

Is it mine?

9 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.08.7highCVSS: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:Xsecondary

v4.07.7highCVSS: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:P/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-459USCWE-459US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Mkway/CVE-2026-3304Reproduction lab for CVE-2026-3304 — async fileFilter race condition in Multer causes disk exhaustion via orphaned temp filesPoC · poc_in_github

affected products (9)

Products and version ranges known to be affected.

HCL BigFix Service Management <27 Hotfixall versionscert_bundDE
HCL BigFix≤ Service Management <27 Hotfixcert_bundDE
IBM App Connect Enterprise≤ Certified Container Operator <13.0.0cert_bundDE
IBM App Connect Enterprise≤ Container Operator <12.0.22cert_bundDE
IBM App Connect Enterprise< 12.0.12.24cert_bundDE
IBM App Connect Enterprise< 13.0.7.0cert_bundDE
expressjs multer0.0.0 → 2.1.0enisa_euvdEU
expressjs multer< 2.1.0nvdUScpe:2.3:a:expressjs:multer:*:*:*:*:*:*:*:*
npm multer< 2.1.0osvUSpkg:npm/multer

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0903IBM App Connect Enterprise: Mehrere Schwachstellen ermöglichen Denial of ServiceDeutsch2026-03-29csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um einen Denial of Service Angriff durchzuführen.
WID-SEC-W-2026-2394HCL BigFix (Service Management): Mehrere Schwachstellen ermöglichen Denial of ServiceDeutsch2026-07-16csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in HCL BigFix (Service Management) ausnutzen, um einen Denial of Service Angriff durchzuführen.
GHSA-xf7r-hgr6-v32pMulter vulnerable to Denial of Service via incomplete cleanup2026-03-01ghsa · osvUS
### 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

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2026-02-27modified 2026-07-15

references (18)

External citations — patches, advisories, analysis.

scry

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