expressjs/multer · Security
Multer vulnerable to Denial of Service via memory leaks from unclosed streams
- GHSA ID
- GHSA-44fp-w29j-9vj5
- CVE ID
- CVE-2025-47935
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
CWEs
- CWE-401 · Missing Release of Memory after Effective Lifetime
References
- https://github.com/expressjs/multer/security/advisories/GHSA-44fp-w29j-9vj5 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2025-47935 ↗
- https://github.com/expressjs/multer/pull/1120 ↗
- https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665 ↗
- https://github.com/advisories/GHSA-44fp-w29j-9vj5 ↗