Project: urllib3

Language python
OSS-Fuzz project link
Project repository link
Build status: Fuzzers failing: Build log
Build status: Code coverage succeeding: Build log
Build status: Fuzz Introspector succeeding: Build log
Fuzzer count 2
Lines of code 3856
Lines covered 1270
Code coverage 32.94%
Code coverage report Report link
Static reachability 0.00%
Fuzz Introspector report Report link (from 2025-07-23)

Historical Progression

Functions of interest to fuzz

This section outlines functions that may be of interest to fuzz. They are based on ranking functions that have a lot of complexity but currently exhibit low code coverage. The complexity is calculated based on the function itself as well as the functions called by the given function, i.e. the tree of code that the function triggers.


This is only a minor amount of introspection information available for this project. Please consult the Fuzz Introspector report for more information, e.g. the introspection table of all functions in the target project available here.

Function name Function source file Accumulated cyclomatic complexity Code coverage
connectionpool.HTTPConnectionPool.urlopen connectionpool 259 4.166%
_request_methods.RequestMethods.request _request_methods 253 0.0%
connection.HTTPSConnection.connect connection 234 0.0%
_request_methods.RequestMethods.request_encode_body _request_methods 232 0.0%
poolmanager.PoolManager.urlopen poolmanager 226 4.761%
connection.HTTPSConnection._connect_tls_proxy connection 217 0.0%
connection._ssl_wrap_socket_and_match_hostname connection 214 0.0%
contrib.emscripten.connection.EmscriptenHTTPConnection.request contrib.emscripten.connection 211 0.0%
_request_methods.RequestMethods.request_encode_url _request_methods 179 0.0%
poolmanager.ProxyManager.urlopen poolmanager 166 0.0%