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CVE-2026-87908— multiparty vulnerable to Denial of Service via unbounded part-header accumulation

Quick assessment

Affected
multiparty multiparty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

multiparty 是一个用于解析 multipart/form-data 请求体的 Node.js 库。在 2.1.0 至 4.3.1（不含）之间的版本中，解析器在累积单个 multipart 部分的头部时，未对所用内存量进行限制。未经身份验证的攻击者可以发送一个请求，其中某个部分携带大量头部字节，迫使解析器缓冲所有头部内容，从而耗尽进程内存，导致服务器崩溃。这是一个拒绝服务（DoS）漏洞，不影响数据的机密性或完整性。该问题已在 multiparty 4.3.1 中修复，新版本对累积的部件头部大小设置了上限。用

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1020 · Automated Exfiltration
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I. Basic Information for CVE-2026-87908

Vulnerability Information
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Vulnerability Title
multiparty vulnerable to Denial of Service via unbounded part-header accumulation
Source: CVE Program / CVE List V5
Vulnerability Description
multiparty is a Node.js library for parsing multipart/form-data request bodies. In versions from 2.1.0 up to but not including 4.3.1, the parser does not bound the amount of memory used while accumulating the headers of a single multipart part. An unauthenticated attacker can send a single request whose part carries a very large volume of header bytes, forcing the parser to buffer all of them and exhausting the process memory, which crashes the server. This is a denial of service with no confidentiality or integrity impact. The issue is fixed in multiparty 4.3.1, which caps the size of the accumulated part headers. Users should upgrade to multiparty 4.3.1 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
multiparty multiparty 2.1.0 ~ 4.3.1 -

II. Public POCs for CVE-2026-87908

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III. Intelligence Information for CVE-2026-87908

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Vendor Advisories for CVE-2026-87908 (1)

IV. Related Vulnerabilities

Same product: multiparty
Same vendor: multiparty
Same weakness: CWE-400

V. Comments for CVE-2026-87908

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