## CVE-2023-46136: High-Severity DoS Flaw in Werkzeug Forces Major Version Bump to 3.0.1
A high-severity denial-of-service (DoS) vulnerability in the widely-used Python web framework Werkzeug has been disclosed, forcing a major version upgrade that requires immediate code changes for affected projects. The flaw, tracked as CVE-2023-46136, resides in the library's multipart form data parser and can be triggered by a maliciously crafted request containing a large part with a specific CR/LF character sequence at the beginning. This triggers abnormally high resource consumption, potentially crippling server availability.

The vulnerability affects all versions of Werkzeug from 0.9.0 up to, but not including, 3.0.1. The only remediation is an upgrade to version 3.0.1, which constitutes a major version bump from the widely deployed 2.0.2. This is not a simple patch; the new release changes the signature of several internal utilities, meaning developers must audit and potentially modify their codebase for compatibility. The advisory explicitly warns that the fix "likely needs code changes," moving this from a routine security update to a significant development task.

The discovery, routed to a remediation system for automated patching, underscores the operational risk for countless Python web applications and services built on Flask and other frameworks dependent on Werkzeug. Organizations now face a dual pressure: the urgent need to mitigate a high-severity DoS vector and the immediate engineering overhead of adapting to breaking API changes in a core dependency. Failure to act exposes services to trivial resource exhaustion attacks.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: CVE-2023-46136, Python, Web Security, Denial of Service, Dependency Management
- **Credibility**: unverified
- **Published**: 2026-04-19 23:22:35
- **ID**: 71451
- **URL**: https://whisperx.ai/en/intel/71451