Multer vulnerable to Denial of Service via incomplete cleanup
### Impact A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. ### Patches Users should upgrade to `2.1.0` ### Workarounds None
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-3304US | high7.5 | Exploit | ||
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 sendi… | ||||
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references
External citations — patches, advisories, analysis.
- https://cna.openjsf.org/security-advisories.htmlWEB
- https://github.com/expressjs/multerPACKAGE
- https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74eeWEB
- https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32pWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-3304ADVISORY
- https://www.cve.org/CVERecord?id=CVE-2026-3304WEB
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