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CVE-2026-3304

HighPublished

Multer vulnerable to Denial of Service via incomplete cleanup

Published: Feb 27, 2026
Updated: Jul 15, 2026
Assigning CNA: openjs
Evidence observed: Aug 25, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

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

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 49.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-3304Exploit
Reproduction lab for CVE-2026-3304, a Multer async fileFilter race condition causing disk exhaustion via orphaned temp files. Includes vulnerable and patched Docker servers, exploit scripts, and root cause analysis.

Responsible use

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