multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. May 12, 2026 · NIST NVD

   Detected

   multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exceptio

2. Jun 17, 2026 · NIST NVD

   Updated

   multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exceptio

Affected

• cpe pillarjs/multipartyversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-8161

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-8161

  multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .pu

  nvd.nist.gov

References

• Third Party Advisory · cna.openjsf.org
• Vendor Advisory · github.com