Werkzeug
CVE-2023-46136
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 8.0 (HIGH). Attack characteristics: adjacent network attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.64%. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to cause denial of service by exhausting system resources. |
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Alert meAnalysisAI
Werkzeug is a comprehensive WSGI web application library. Rated high severity (CVSS 8.0), this vulnerability is low attack complexity. This Uncontrolled Resource Consumption vulnerability could allow attackers to cause denial of service by exhausting system resources.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in pypi
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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. Affected products include: Palletsprojects Werkzeug. Version information: prior to 3.0.1.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
DescriptionGitHub Advisory
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
Werkzeug is a comprehensive WSGI web application library. Rated high severity (CVSS 7.5), this vulnerability is remotely
In Pallets Werkzeug before 0.15.5, SharedDataMiddleware mishandles drive names (such as C:) in Windows pathnames. Rated
Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL. Rated medium severity (CVSS 6.1), t
Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smugglin
Werkzeug is a comprehensive WSGI web application library. Rated high severity (CVSS 7.5), this vulnerability is remotely
Pallets Werkzeug before 0.15.3, when used with Docker, has insufficient debugger PIN randomness because Docker container
A user-controlled request path that ends in a Windows reserved device name followed by an empty NTFS alternate data stre
Werkzeug is a comprehensive WSGI web application library. Rated medium severity (CVSS 6.3), this vulnerability is remote
Werkzeug is a Web Server Gateway Interface web application library. Rated medium severity (CVSS 6.3), this vulnerability
Cross-site scripting (XSS) vulnerability in the render_full function in debug/tbtools.py in the debugger in Pallets Werk
Werkzeug versions 3.1.5 and below on Windows fail to properly filter reserved device names in the safe_join function whe
Werkzeug versions prior to 3.1.5 fail to properly validate Windows reserved device names in the safe_join function, allo
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