multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
History

Fri, 11 Sep 2026 07:00:00 +0000

Type Values Removed Values Added
Description multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
Title multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Weaknesses CWE-400
CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published: 2026-09-11T06:37:51.216Z

Updated: 2026-09-11T15:54:32.991Z

Reserved: 2026-09-09T15:07:30.466Z

Link: CVE-2026-87908

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-11T07:16:47.937

Modified: 2026-09-11T16:17:48.057

Link: CVE-2026-87908

cve-icon Redhat

No data.