Checkmarx AI Remediation - CVE-2023-46136#4
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Fixed Issues (6)
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Checkmarx One – Remediation
CVE-2023-46136 ·
High
Triage context:
Reachable · 
Exploitable
Fix CVE-2023-46136 DoS vulnerability in Werkzeug
What is the issue?
CVE-2023-46136 is a high-severity denial-of-service vulnerability in Werkzeug that allows attackers to craft malicious multipart form data to trigger excessive CPU consumption. Attackers can send multipart POST requests with CR/LF characters followed by megabytes of data without proper boundaries, causing Werkzeug to perform inefficient buffer operations and blocking worker processes from handling legitimate requests.
Why should it be fixed?
This vulnerability poses significant risk to application availability and performance. Attackers can exploit file upload endpoints to exhaust server resources, causing service degradation or complete downtime. The HIGH severity rating and DoS attack vector make this critical for maintaining security posture and preventing financial losses from service unavailability.
How should it be fixed?
Upgrade Werkzeug from 1.0.1 to 3.0.1 in backend/requirements.txt to apply the vendor's security patch. Upgrade Flask from 1.1.4 to 2.3.3, Flask-SQLAlchemy to 3.0.5, Flask-JWT-Extended to 4.5.3, SQLAlchemy to 1.4.54, Jinja2 to 3.1.4, and MarkupSafe to 2.1.5 to maintain compatibility with Werkzeug 3.0.1. Replace deprecated
_request_ctx_stackAPI withhas_request_context()in backend/app.py to support Flask 2.x. Create comprehensive test suite in backend/test_app.py with CVE-2023-46136 specific tests, Flask 2.x compatibility tests, and version verification tests to prevent regression.Use @Checkmarx to interact with Checkmarx PR Assistant.
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