GHSA-qxch-whhj-8956
multiparty: Denial of Service via Prototype Pollution leads to Uncaught Exception
Quick fix
GHSA-qxch-whhj-8956 — multiparty: upgrade to the fixed version with the command below.
npm install multiparty@4.3.0Details
### Impact
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 field name that collides with an inherited `Object.prototype` property (e.g., `__proto__`, `constructor`, `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. Any service accepting multipart uploads via multiparty is affected.
### Patches
Users should upgrade to multiparty@4.3.0 or higher.
### Workarounds
None.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-8161[ADVISORY]
- https://cna.openjsf.org/security-advisories.html[WEB]
- https://github.com/pillarjs/multiparty[PACKAGE]
- https://github.com/pillarjs/multiparty/releases/tag/v4.3.0[WEB]