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CVE-2023-46136— Werkzeug vulnerable to high resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning

CVSS 8.0 · High EPSS 1.07% · P62

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
palletswerkzeug>= 3.0.0, < 3.0.1affected
>= 2.0.0rc1, < 2.3.8affected
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I. Basic Information for CVE-2023-46136

Vulnerability Information
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Vulnerability Title
Werkzeug vulnerable to high resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Source: CVE Program / CVE List V5
Vulnerability Description
Werkzeug is a comprehensive WSGI web application library. In versions on the 3.x branch prior to 3.0.1 and on the 2.x branch prior to 2.3.8, if an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1 and 2.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Pallets Werkzeug 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pallets Werkzeug是一款WSGI Web应用程序库。 Pallets Werkzeug 3.0.1之前版本存在安全漏洞，该漏洞源于允许攻击者通过将精心设计的多部分数据发送导致拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
palletswerkzeug >= 3.0.0, < 3.0.1 -

II. Public POCs for CVE-2023-46136

#POC DescriptionSource LinkShenlong Link
1Exploit for Werkzeug < 3.1.4 (CVE-2023-46136)https://github.com/JawadPy/WerkGhostPOC Details
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 9654 chars
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III. Intelligence Information for CVE-2023-46136

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Patches & Fixes for CVE-2023-46136 (1)

Vendor Advisories for CVE-2023-46136 (1)

IV. Related Vulnerabilities

Same product: werkzeug
Same vendor: pallets
Same weakness: CWE-407

V. Comments for CVE-2023-46136

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