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If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).","2020-03-06",7.5,"v3.1","High",0.03371,{"cveId":249,"description":250,"publishedDate":251,"cvssScore":244,"cvssVersion":245,"severity":246,"isKev":16,"epssScore":252},"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.","2021-06-29",0.03273,{"cveId":254,"description":255,"publishedDate":256,"cvssScore":244,"cvssVersion":237,"severity":246,"isKev":16,"epssScore":257},"CVE-2019-11324","The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.","2019-04-18",0.02915,{"cveId":259,"description":260,"publishedDate":261,"cvssScore":262,"cvssVersion":245,"severity":263,"isKev":16,"epssScore":264},"CVE-2020-26137","urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.","2020-09-30",6.5,"Medium",0.02269,{"cveId":266,"description":267,"publishedDate":268,"cvssScore":262,"cvssVersion":245,"severity":263,"isKev":16,"epssScore":269},"CVE-2021-28363","The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.","2021-03-15",0.02166,{"cveId":271,"description":272,"publishedDate":273,"cvssScore":274,"cvssVersion":237,"severity":263,"isKev":16,"epssScore":275},"CVE-2019-11236","In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.","2019-04-15",6.1,0.02073,{"cveId":277,"description":278,"publishedDate":279,"cvssScore":280,"cvssVersion":245,"severity":263,"isKev":16,"epssScore":281},"CVE-2023-43804","urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.","2023-10-04",5.9,0.0136,{"cveId":283,"description":284,"publishedDate":285,"cvssScore":286,"cvssVersion":237,"severity":287,"isKev":16,"epssScore":288},"CVE-2016-9015","Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. 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