CVE-2026-3304
Multer vulnerable to Denial of Service via incomplete cleanup
HIGH 8.7EPSS 0.9%
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.
- Affected
- expressjs · multer
- CVSS v4.0 CNA
- 8.7 HIGH
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 - CVSS v4.0 GitHub
- 8.7 HIGH
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 - CVSS v3.1 NVD
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.88% chance of exploitation in the next 30 days, 58th percentile
- Published
- 2026-02-27
- Updated
- 2026-07-15
Proof-of-concept exploits (1)
- Mkway/CVE-2026-3304/blob/9e44127a84796a8e538af3b239b2c72dab0d038a/exploit/curl_poc.sh0★ · 2026-03-09
Security advisories
- https://cna.openjsf.org/security-advisories.html
- expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p
- advisories/GHSA-xf7r-hgr6-v32p
- expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee