Vulnerability Details CVE-2026-8161
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 6.4%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-8161
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cpe:2.3:a:pillarjs:multiparty:0.1.0
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cpe:2.3:a:pillarjs:multiparty:0.2.0
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cpe:2.3:a:pillarjs:multiparty:0.3.0
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cpe:2.3:a:pillarjs:multiparty:0.4.0
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cpe:2.3:a:pillarjs:multiparty:0.5.0
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cpe:2.3:a:pillarjs:multiparty:0.6.0
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cpe:2.3:a:pillarjs:multiparty:0.7.0
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cpe:2.3:a:pillarjs:multiparty:0.8.0
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cpe:2.3:a:pillarjs:multiparty:0.9.0
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cpe:2.3:a:pillarjs:multiparty:0.9.1
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cpe:2.3:a:pillarjs:multiparty:0.9.10
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cpe:2.3:a:pillarjs:multiparty:0.9.11
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cpe:2.3:a:pillarjs:multiparty:0.9.2
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cpe:2.3:a:pillarjs:multiparty:0.9.3
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cpe:2.3:a:pillarjs:multiparty:0.9.4
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cpe:2.3:a:pillarjs:multiparty:0.9.5
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cpe:2.3:a:pillarjs:multiparty:0.9.6
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cpe:2.3:a:pillarjs:multiparty:0.9.7
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cpe:2.3:a:pillarjs:multiparty:0.9.8
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cpe:2.3:a:pillarjs:multiparty:0.9.9
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cpe:2.3:a:pillarjs:multiparty:1.0.0
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cpe:2.3:a:pillarjs:multiparty:1.0.1
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cpe:2.3:a:pillarjs:multiparty:1.0.10
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cpe:2.3:a:pillarjs:multiparty:1.0.11
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cpe:2.3:a:pillarjs:multiparty:1.0.2
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cpe:2.3:a:pillarjs:multiparty:1.0.3
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cpe:2.3:a:pillarjs:multiparty:1.0.4
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cpe:2.3:a:pillarjs:multiparty:1.0.5
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cpe:2.3:a:pillarjs:multiparty:1.0.6
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cpe:2.3:a:pillarjs:multiparty:1.0.7
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cpe:2.3:a:pillarjs:multiparty:1.0.8
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cpe:2.3:a:pillarjs:multiparty:1.0.9
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cpe:2.3:a:pillarjs:multiparty:2.0.0
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cpe:2.3:a:pillarjs:multiparty:2.1.0
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cpe:2.3:a:pillarjs:multiparty:2.1.1
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cpe:2.3:a:pillarjs:multiparty:2.1.2
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cpe:2.3:a:pillarjs:multiparty:2.1.3
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cpe:2.3:a:pillarjs:multiparty:2.1.4
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cpe:2.3:a:pillarjs:multiparty:2.1.5
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cpe:2.3:a:pillarjs:multiparty:2.1.6
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cpe:2.3:a:pillarjs:multiparty:2.1.7
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cpe:2.3:a:pillarjs:multiparty:2.1.8
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cpe:2.3:a:pillarjs:multiparty:2.1.9
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cpe:2.3:a:pillarjs:multiparty:2.2.0
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cpe:2.3:a:pillarjs:multiparty:3.0.0
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cpe:2.3:a:pillarjs:multiparty:3.1.0
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cpe:2.3:a:pillarjs:multiparty:3.1.1
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cpe:2.3:a:pillarjs:multiparty:3.1.2
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cpe:2.3:a:pillarjs:multiparty:3.2.0
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cpe:2.3:a:pillarjs:multiparty:3.2.1
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cpe:2.3:a:pillarjs:multiparty:3.2.10
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cpe:2.3:a:pillarjs:multiparty:3.2.2
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cpe:2.3:a:pillarjs:multiparty:3.2.3
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cpe:2.3:a:pillarjs:multiparty:3.2.4
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cpe:2.3:a:pillarjs:multiparty:3.2.5
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cpe:2.3:a:pillarjs:multiparty:3.2.6
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cpe:2.3:a:pillarjs:multiparty:3.2.7
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cpe:2.3:a:pillarjs:multiparty:3.2.8
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cpe:2.3:a:pillarjs:multiparty:3.2.9
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cpe:2.3:a:pillarjs:multiparty:3.3.0
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cpe:2.3:a:pillarjs:multiparty:3.3.1
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cpe:2.3:a:pillarjs:multiparty:3.3.2
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cpe:2.3:a:pillarjs:multiparty:4.0.0
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cpe:2.3:a:pillarjs:multiparty:4.1.0
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cpe:2.3:a:pillarjs:multiparty:4.1.1
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cpe:2.3:a:pillarjs:multiparty:4.1.2
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cpe:2.3:a:pillarjs:multiparty:4.1.3
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cpe:2.3:a:pillarjs:multiparty:4.1.4
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cpe:2.3:a:pillarjs:multiparty:4.2.0
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cpe:2.3:a:pillarjs:multiparty:4.2.1
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cpe:2.3:a:pillarjs:multiparty:4.2.2
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cpe:2.3:a:pillarjs:multiparty:4.2.3