CVE-2026-8162

HIGH

multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing

Title source: cna
STIX 2.1

Description

[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.

Scores

CVSS v3 7.5
EPSS 0.0006
EPSS Percentile 17.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-755
Status published
Products (4)
multiparty/multiparty < 4.2.3
multiparty/multiparty 4.3.0
npm/multiparty 0 - 4.3.0npm
pillarjs/multiparty < 4.3.0
Published May 12, 2026
Tracked Since May 12, 2026