CPython

Category - Programming Languages

CPython is the reference implementation of the Python programming language. Written in C and Python, CPython is the default and most widely-used implementation of the language.


We have discovered  527 live websites   are using CPython.

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Technology usage statistics

Websites using CPython:527 websites
Most popular in: United States
Market position in Programming Languages category:#23
Market penetration in Programming Languages:less than 0.1%
Most popular version:3.8.5

Security vulnerabilites

Top 10 most common security vulnerabilities associated with CPython
PublishedCVETitleDomains
Aug, 2026CVE-2026-19672tarfile extraction filter bypass allows creation of directories outside the destination456
Jun, 2026CVE-2026-11972tarfile opened in streaming mode mishandles EOF456
Aug, 2026CVE-2026-15310zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits455
Aug, 2026CVE-2026-15806`HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching455
Aug, 2026CVE-2026-17084stringprep.map_table_b2() deviates from RFC 3454 Table B.2455
Aug, 2026CVE-2026-18503Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()455
Jul, 2026CVE-2026-6879Quadratic Behavior in xml.etree.ElementPath Index Predicates455
Jul, 2026CVE-2026-15308Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations455
Jun, 2026CVE-2026-4360Tarfile.extract() doesn't fully respect filter parameter455
Jun, 2026CVE-2026-0864Configuration Injection via Carriage Return (\r) in write() method455

Technology adoption

Recent changes in CPython usage.
Websites that added CPython 107
Websites that dropped CPython 69
Websites that changed version of CPython  44

Available Reports


Technology Information


Major Versions

  • 3.xx (65 subversions, 414 domains)

Website Distribution by Country

Number of websites using CPython
United States200 websites


Germany65 websites
Singapore28 websites
France24 websites
India20 websites
Russia14 websites
China14 websites
GB13 websites
Brazil11 websites
Italy11 websites

Website Distribution by TLD

Number of websites using CPython
.com171 websites
.org79 websites
.net23 websites
.dk23 websites
.de22 websites
.fr9 websites
.org.ar8 websites
.ch8 websites
.nl7 websites
.edu7 websites

CPython Versions

sorted by popularity
3.8.535 websites
3.10.1228 websites
3.12.324 websites
3.12.1322 websites
3.9.2521 websites
3.8.1015 websites
3.6.915 websites
3.12.1213 websites
3.11.213 websites
3.6.1512 websites

See all CPython versions ...

Top Websites Using CPython

A look at the most popular websites built with CPython
DomainCountryRankContacts
python.org United States1,453
pypi.org United States1,628
docs.python.org United States2,015
mail.python.org United States15,905
packaging.python.org United States15,916
wiki.python.org United States18,678
See full domain list

Always Used together


Python: Total 309,753 domains found using Python
Category - Programming Languages. 23,190,997 domains found using Programming Languages

Alternative Technologies


PHP: Total 20,814,350 domains found using PHP
Node.js: Total 888,492 domains found using Node.js
Java: Total 550,252 domains found using Java
Ruby: Total 336,651 domains found using Ruby
Python: Total 309,753 domains found using Python
Adobe Flash: Total 290,508 domains found using Adobe Flash
TypeScript: Total 128,884 domains found using TypeScript
Erlang: Total 105,662 domains found using Erlang
CSharp: Total 97,211 domains found using CSharp
CFML: Total 77,631 domains found using CFML

FAQ

CPython falls under the category of Programming Languages.
WebTechSurvey systematically indexes websites and their technologies. Users can find websites using CPython through the WebTechSurvey platform.
There are currently 57,867,524 live websites that use CPython.
The main competitors to CPython include PHP, Node.js, Java, and Ruby.
CPython has a known security vulnerabilities: CVE-2026-15310, CVE-2026-19672, CVE-2026-15806, and CVE-2026-17084.