CVE-2026-8162
HighSummary
Versions of multiparty up to 4.2.3 are vulnerable to denial of service due to an uncaught exception. By sending a multipart/form-data request with a malformed percent-encoding in the Content-Disposition header, the parser invokes decodeURI without error handling, leading to a process crash.
Risk Assessment
Any service accepting multipart uploads via multiparty is at risk of crashing, potentially causing application downtime.
Recommendation
It is recommended to upgrade to multiparty version 4.3.0 or higher to mitigate this vulnerability.
Other vulnerabilities in multiparty
See all- CVE-2026-8161High
Versions of multiparty up to 4.2.3 are vulnerable to denial of service due to an uncaught exception. By sending a multipart/form-data request with a field name that collides with an Object.prototype property, the parser invokes .push() on the inherited prototype value, leading to a TypeError and crashing the process.
- CVE-2026-8159High
Versions of multiparty up to 4.2.3 are vulnerable to denial of service due to regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop.
Original NVD description (English source)
[email protected] 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 [email protected] or higher.