Multiple CVEs Address URL Handling Vulnerabilities in Python Libraries

CVE-2023-26159 Versions of the package follow-redirects before 1.15.4 are vulnerable to Improper Input Validation due to the improper handling of URLs by the url.parse() function. When new URL() throws an error it can be manipulated to misinterpret the hostname. An attacker could exploit this weakness to redirect traffic to a malicious site potentially leading to information disclosure phishing attacks or other security breaches.

CVE-2021-33503 An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component the authority regular expression exhibits catastrophic backtracking causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.