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CVE-2026-8161— multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception

CVSS 7.5 · High EPSS 0.04% · P12
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I. Basic Information for CVE-2026-8161

Vulnerability Information
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Vulnerability Title
multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未捕获的异常
Source: NVD (National Vulnerability Database)
Vulnerability Title
multiparty 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
multiparty是pillarjs开源的一个解析HTTP multipart/form-data请求的Node.js模块。 multiparty 4.2.3及之前版本存在安全漏洞，该漏洞源于未捕获异常，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
multipartymultiparty 0 ~ 4.2.3 -

II. Public POCs for CVE-2026-8161

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III. Intelligence Information for CVE-2026-8161

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Same Patch Batch · multiparty · 2026-05-12 · 3 CVEs total

CVE-2026-81627.5 HIGHmultiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter p
CVE-2026-81597.5 HIGHmultiparty vulnerable to ReDoS via filename parsing

IV. Related Vulnerabilities

Same product: multiparty
Same vendor: multiparty
Same weakness: CWE-248

V. Comments for CVE-2026-8161

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