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Vulnerability record · CVE-2026-8161 · published 12 May 2026

CVE-2026-8161: Pillarjs multiparty prototype pollution vulnerability

PPillarjs · Multiparty

[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.

7.5 CVSS 3.1 High EPSS 0.53% · top 57.3% CWE-248 · CWE-248CWE-1321 · Prototype pollution
7.5CVSS 3.1 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

[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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cna.openjsf.org/security-advisories.html Third Party Advisory
https://github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-8162Pillarjs multiparty vulnerability[email protected] and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a Conte…EPSS 0.58%7.5CVE-2026-8159Pillarjs multiparty inefficient regular expression (redos) vulnerability[email protected] and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename param…EPSS 0.62%

Source: NIST National Vulnerability Database (record CVE-2026-8161), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.