Multer vulnerable to Denial of Service from maliciously crafted requests
### Impact A vulnerability in Multer versions >=1.4.4-lts.1 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. ### Patches Users should upgrade to `2.0.0` ### Workarounds None ### References - https://github.com/expressjs/multer/issues/1176 - https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-47944US | — | — | ||
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.0 allows an attacker to… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/expressjs/multerPACKAGE
- https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665WEB
- https://github.com/expressjs/multer/issues/1176WEB
- https://github.com/expressjs/multer/security/advisories/GHSA-4pg4-qvpc-4q3hWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-47944ADVISORY
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