What is CVE-2026-3304?

CVE-2026-3304 is a vulnerability in Expressjs Multer, classified under Incomplete Cleanup. Published 2026-02-27.

Is CVE-2026-3304 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Expressjs Multer

CVE-2026-3304

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 exhaust…

EPSS: 0.006 (41.7th percentile) — read the EPSS interpretation.

Affected products

Expressjs Multer — versions 0.0.0

Weakness classification (CWE)

CWE-459 — Incomplete Cleanup

Public proof-of-concept exploits

Mkway/CVE-2026-3304

References

github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p
www.cve.org/CVERecord
github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee
cna.openjsf.org/security-advisories.html

Frequently asked questions

What is CVE-2026-3304?: CVE-2026-3304 is a vulnerability in Expressjs Multer, classified under Incomplete Cleanup. Published 2026-02-27.
Is CVE-2026-3304 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.