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CVE-2026-8159— multiparty vulnerable to ReDoS via filename parsing

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Content-Disposition文件名参数解析器中正则表达式回溯，可能导致特制多部分上传请求中长标头值使正则匹配耗时数秒，阻塞事件循环，导致拒绝服务。

CVSS 7.5 · High EPSS 0.34% · P27

Affected Version Matrix 2

VendorProduct Version RangeStatus
multiparty multiparty ≤ 4.2.3 affected
4.3.0 unaffected
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I. Basic Information for CVE-2026-8159

Vulnerability Information
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Vulnerability Title
multiparty vulnerable to ReDoS via filename parsing
Source: CVE Program / CVE List V5
Vulnerability Description
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
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
CWE-1333
Source: CVE Program / CVE List V5
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Content-Disposition文件名参数解析器中正则表达式回溯，可能导致特制多部分上传请求中长标头值使正则匹配耗时数秒，阻塞事件循环，导致拒绝服务。
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

Vendor Product Affected Versions CPE Subscribe
multiparty multiparty 0 ~ 4.2.3 -

II. Public POCs for CVE-2026-8159

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III. Intelligence Information for CVE-2026-8159

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Vendor Advisories for CVE-2026-8159 (1)

News Coverage for CVE-2026-8159 (1)

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

CVE-2026-8162 7.5 HIGH multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter p
CVE-2026-8161 7.5 HIGH multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exc

IV. Related Vulnerabilities

Same product: multiparty
Same vendor: multiparty
Same weakness: CWE-1333

V. Comments for CVE-2026-8159

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