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CVE-2026-42561— Python-Multipart: Denial of Service via unbounded multipart part headers

Quick assessment

Affected
Kludex python-multipart
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.

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。

CVSS 7.5 · High EPSS 0.85% · P57

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: 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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-42561

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Vendor Advisories for CVE-2026-42561 (1)

IV. Related Vulnerabilities

Same product: python-multipart
Same vendor: Kludex
Same weakness: CWE-770

V. Comments for CVE-2026-42561

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