CVE-2026-8162CWE-755

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

High · published May 12, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
46.7
In the wild
Unconfirmed
What it is

[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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00576 · 46.7th percentile
Weakness
CWE-755 · Improper Handling of Exceptional Conditions
Published
2026-05-12T09:05Z
EPSS history
Timeline
  • 12 MAY 09:05Z
    multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing
    cvelistv5