Bug 2531767 (CVE-2026-87908)

Summary: CVE-2026-87908 multiparty: multiparty: Denial of Service via unbounded part-header accumulation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gmalinko, janstey, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in multiparty, a Node.js library for parsing multipart/form-data request bodies. The parser does not properly limit the memory used when accumulating headers of a single multipart part. An unauthenticated attacker can exploit this by sending a request with a large volume of header bytes, causing the parser to exhaust process memory and crash the server. This leads to a Denial of Service (DoS) with no impact on confidentiality or integrity.
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Description OSIDB Bzimport 2026-09-11 06:51:30 UTC 
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.