CVE-2026-8162
multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing
- State
- Published
- Severity
- 7.5 High
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Reserved
- May 8, 2026
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 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | openjs |
Weaknesses
- CWE-755 Improper Handling of Exceptional Conditions
Affected Products
| Product | Versions |
|---|---|
multipartymultiparty |
|
References
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