CVE-2026-8161
multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
[email protected] and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that 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.
| CWE | CWE-248 CWE-1321 |
| Vendor | multiparty |
| Product | multiparty |
| Published | May 12, 2026 |
| Last Updated | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
multiparty / multiparty
0 ≤ 4.2.3
References
Credits
🔍 Ser0n-ath Sebastian Beltran kq5y Byambadalai Sumiya Blake Embrey Ulises Gascón