High 8.7Published Feb 27, 2026

CVE-2026-3304Multer vulnerable to Denial of Service via incomplete cleanup

Updated under an hour ago (Oct 26, 2026, 7:40 PM ET)

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It affects expressjs multer and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for expressjs multer

Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-459
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: openjs
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

expressjs multer expressjs:multer (from the name)	from 0.0.0 before 2.1.0	CNA record
Red Hat Red Hat Developer Hub 1.8 redhat:rhdh	from 1774545605 not affected	CISA ADP
Red Hat Logging Subsystem for Red Hat OpenShift redhat:logging	5	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
Red Hat Red Hat Trusted Profile Analyzer redhat:trusted_profile_analyzer	2	CISA ADP
Red Hat Self-service automation portal 2 redhat:ansible_portal	2	CISA ADP
expressjs multer expressjs:multer	before 2.1.0	NVD

References

References

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
https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee	patch
https://cna.openjsf.org/security-advisories.html	vendor-advisory
https://access.redhat.com/errata/RHSA-2026:6174
https://access.redhat.com/errata/RHSA-2026:6802
https://access.redhat.com/security/cve/CVE-2026-3304
https://bugzilla.redhat.com/show_bug.cgi?id=2443353
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3304.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.