pillarjs multiparty up to 4.3.0 denial of service

Summaryinfo

A vulnerability classified as problematic has been found in pillarjs multiparty up to 4.3.0. This issue affects some unknown processing. This manipulation causes denial of service. This vulnerability appears as CVE-2026-87908. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in pillarjs multiparty up to 4.3.0. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-87908 since 09/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• pillarjs

Name

• multiparty

Version

• 4.0
• 4.1
• 4.2
• 4.3.0

Website

• Product: https://github.com/pillarjs/multiparty/

CPE 2.3info

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CPE 2.2info

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