CVE-2026-8162: Pillarjs Multiparty

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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 Content-Disposition header whose filename* parameter contains a malformed percent-encoding, the parser invokes decodeURI on the value without try/catch. The resulting URIError 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

• Pillarjs Multiparty: before 4.3.0 (fixed in 4.3.0)

Published 2026-05-12. Last modified 2026-06-17.