High severity7.5NVD Advisory· Published May 12, 2026· Updated May 13, 2026
CVE-2026-8161
CVE-2026-8161
Description
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 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 multiparty@4.3.0 or higher.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
multipartynpm | < 4.3.0 | 4.3.0 |
Affected products
1Patches
Vulnerability mechanics
References
5- cna.openjsf.org/security-advisories.htmlnvdThird Party AdvisoryWEB
- github.com/advisories/GHSA-qxch-whhj-8956ghsaADVISORY
- github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-8161ghsaADVISORY
- github.com/pillarjs/multiparty/releases/tag/v4.3.0ghsaWEB
News mentions
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