Secure Python URL validation
Blog post from Snyk
URLs are essential internet identifiers but can become major security risks when applications accept untrusted input, enabling attacks such as cross-site scripting, phishing, server-side request forgery, and remote code execution exemplified by Log4j’s JNDI vulnerability. Applications should validate and sanitize externally supplied URLs to ensure they are properly formed, use permitted protocols, and do not target internal or otherwise restricted network resources. In Python, the third-party validators package can check URL structure and public accessibility, while urllib.parse can inspect components such as the scheme and network location; regular expressions can enforce specific requirements such as HTTPS but are generally difficult to maintain for comprehensive validation. Framework-provided validators may also help, but developers should assess the security, licensing, and vulnerability history of dependencies through tools such as Snyk Advisor, Snyk Open Source, and vulnerability databases.
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