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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-8161

multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception

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Status
Published
Published
Updated
Assigning organization
openjs

Description

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 exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

multiparty multiparty

Default version status: unaffected

  • 0 to ≤ 4.2.3affected
  • 4.3.0unaffected
pkg:npm/multiparty

References