CVE-2026-8159— multiparty vulnerable to ReDoS via filename parsing
Possible ATT&CK Techniques 2AI
T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: 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
CWE-1333
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
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V. Comments for CVE-2026-8159
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