CVE-2026-42561— Python-Multipart: Denial of Service via unbounded multipart part headers
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Kludex | python-multipart | < 0.0.27 | affected |
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I. Basic Information for CVE-2026-42561
Vulnerability Information
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Vulnerability Title
Python-Multipart: Denial of Service via unbounded multipart part headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.27, python-multipart has a denial of service vulnerability in multipart part header parsing. When parsing multipart/form-data, MultipartParser previously had no limit on the number of part headers or the size of an individual part header. An attacker could send a request with either many repeated headers without terminating the header block or a single very large header value, causing excessive CPU work before request rejection or completion. This vulnerability is fixed in 0.0.27.
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
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
python-multipart 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
python-multipart是Marcelo Trylesinski个人开发者的一个Python的流式多部分解析器。 python-multipart 0.0.27之前版本存在安全漏洞，该漏洞源于multipart部分标头解析无限制，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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Kludex | python-multipart | < 0.0.27 | - |
II. Public POCs for CVE-2026-42561
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same vendor: Kludex
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V. Comments for CVE-2026-42561
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