GitHub Advisoryadvisory · npm
GHSA-44fp-w29j-9vj5 Multer vulnerable to Denial of Service via memory leaks from unclosed streams
HIGH
Official page ↗
- Aliases
- CVE-2025-47935
- Ecosystem
- npm
- Packages
- multer
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-401
- Reviewed
- 2025-05-19
Affected packages
• npm multer: < 2.0.0 → fixed in 2.0.0
Description
Impact
Multer <2.0.0 is vulnerable to a resource exhaustion and memory leak issue due to improper stream handling. When the HTTP request stream emits an error, the internal `busboy` stream is not closed, violating Node.js stream safety guidance.
This leads to unclosed streams accumulating over time, consuming memory and file descriptors. Under sustained or repeated failure conditions, this can result in denial of service, requiring manual server restarts to recover. All users of Multer handling file uploads are potentially impacted.
Patches
Users should upgrade to `2.0.0`
Workarounds
None
References
• https://github.com/expressjs/multer/pull/1120
• https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665
Related
Alias · CVE (1)
- CVE-2025-47935 Multer is a node.js middleware for handling `multipart/form-data`. vulnerability
Weakness · CWE (1)
- CWE-401 Missing Release of Memory after Effective Lifetime weakness
References
- https://github.com/expressjs/multer/security/advisories/GHSA-44fp-w29j-9vj5 web
- https://nvd.nist.gov/vuln/detail/CVE-2025-47935 advisory
- https://github.com/expressjs/multer/pull/1120 web
- https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665 web
- https://github.com/expressjs/multer package