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CVE-2026-87908

multiparty vulnerable to Denial of Service via unbounded part-header accumulation

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-87908

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87908

Published

multiparty

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "multiparty",
                    "product": "multiparty",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "2.1.0",
                            "lessThan": "4.3.1"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "4.3.1"
                        }
                    ],
                    "packageURL": "pkg:npm/multiparty"
                }

Original source record · Cite this exact observation · Complete original publisher JSON