CVE-2025-66418 urllib3 allows an unbounded number of links in the decompression chain

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory...

urllib3: proxy-authorization request header is not stripped during cross-origin redirects

A flaw was found in urllib3, an HTTP client library for Python. In certain configurations, urllib3 does not treat the Proxy-Authorization HTTP header as one carrying authentication material. This issue results in not stripping the header on cross-origin redirects...

urllib3: proxy-authorization request header is not stripped during cross-origin redirects

A flaw was found in urllib3, an HTTP client library for Python. In certain configurations, urllib3 does not treat the Proxy-Authorization HTTP header as one carrying authentication material. This issue results in not stripping the header on cross-origin redirects...

python-urllib3: Certification mishandle when error should be thrown

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 o...