CVE-2026-3304
Multer vulnerable to Denial of Service via incomplete cleanup
Description
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.
INFO
Published Date :
Feb. 27, 2026, 4:16 p.m.
Last Modified :
March 19, 2026, 5:28 p.m.
Remotely Exploit :
Yes !
Source :
ce714d77-add3-4f53-aff5-83d477b104bb
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | ce714d77-add3-4f53-aff5-83d477b104bb | ||||
| CVSS 4.0 | HIGH | ce714d77-add3-4f53-aff5-83d477b104bb |
Solution
- Upgrade Multer to version 2.1.0.
Public PoC/Exploit Available at Github
CVE-2026-3304 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3304.
| URL | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Vendor Advisory |
| https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee | Patch |
| https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p | Patch Vendor Advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-3304 | VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3304 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3304
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Reproduction lab for CVE-2026-3304 — async fileFilter race condition in Multer causes disk exhaustion via orphaned temp files
Dockerfile JavaScript Shell Python
Security vulnerability disclosures and advisories by Ethan Taebeom Kim (Cremit)
None
Python
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3304 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3304 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 19, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:* versions up to (excluding) 2.1.0 Added Reference Type openjs: https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory Added Reference Type openjs: https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee Types: Patch Added Reference Type openjs: https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p Types: Patch, Vendor Advisory Added Reference Type openjs: https://www.cve.org/CVERecord?id=CVE-2026-3304 Types: VDB Entry -
New CVE Received by ce714d77-add3-4f53-aff5-83d477b104bb
Feb. 27, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 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 Added CWE CWE-459 Added Reference https://cna.openjsf.org/security-advisories.html Added Reference https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee Added Reference https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p Added Reference https://www.cve.org/CVERecord?id=CVE-2026-3304