CVE-2021-28363

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.

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.

CVE-2021-28363

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certific ...

GHSA-5phf-pp7p-vc2r

Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection

BDU:2025-04191

Уязвимость HTTP библиотеки Urllib3 языка программирования Python, связанная с ошибками процедуры подтверждения подлинности сертификата, позволяющая нарушителю получить доступ к конфиденциальным данным и нарушить их целостность