GitHub Advisoryadvisory · npm
GHSA-xh3c-6gcq-g4rv multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing
HIGH
Official page ↗
- Aliases
- CVE-2026-8162
- Ecosystem
- npm
- Packages
- multiparty
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-755
- Reviewed
- 2026-05-18
Affected packages
• npm multiparty: < 4.3.0 → fixed in 4.3.0
Description
Impact
[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: filename*=utf-8''` header containing a malformed percent-encoding (e.g., `%FF`, `%GG`), the parser invokes `decodeURI` on the value without try/catch. The resulting `URIError` propagates as an uncaught exception and crashes the process. Any service accepting multipart uploads via multiparty is affected.
Patches
Users should upgrade to [email protected] or higher.
Workarounds
None.
Related
Alias · CVE (1)
- CVE-2026-8162 [email protected] and lower versions are vulnerable to denial of service via uncaught exception. vulnerability
Weakness · CWE (1)
- CWE-755 Improper Handling of Exceptional Conditions weakness