Yebo Cao

**Name of the Vulnerable Software and Affected Versions** Python versions prior to 3.11.4 **Description** A critical issue in the urllib.parse component of Python allows attackers to bypass blocklisting methods by supplying a URL that starts with blank characters, enabling domain filter bypass, file reads, and command execution. This flaw could be exploited to bypass security restrictions, potentially leading to arbitrary file reads and command execution. The estimated number of potentially affected devices worldwide is not specified. There is no information about real-world incidents where this issue was exploited. **Recommendations** For Python versions prior to 3.11.4, update to version 3.11.4 or later to resolve the issue. As a temporary workaround, consider using the `strip()` function before parsing URLs to remove leading blank characters. Restrict access to the vulnerable `urllib.parse` component to minimize the risk of exploitation. Avoid using URLs that start with blank characters in the affected API endpoints until the issue is resolved.