QBittorrent
QBittorrent
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QBittorrent

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QBittorrent

qBittorrent is a cross-platform free and open-source BitTorrent client written in native C++. It relies on Boost, OpenSSL, zlib, Qt 6 toolkit and the libtorrent-rasterbar library (for the torrent back-end), with an optional search engine written in Python.

qBittorrent was originally developed in March 2006 by Christophe Dumez from the University of Technology of Belfort-Montbéliard (UTBM). It is currently developed by contributors worldwide and is funded through donations, led by Sledgehammer999 from Greece, who became project maintainer in June 2013.

Along with the 4.0.0 release a new logo for the project was unveiled.

In February 2023, a security vulnerability affecting versions 4.5.0 and 4.5.1 was discovered in the Web UI running on Windows systems. This vulnerability enabled unauthenticated access to all files on the host computer via a path traversal bug. This issue has been patched in version 4.5.2, which was released to the public on February 23, 2023.

qBittorrent contained a remote code execution exploit caused by a failure to validate any TLS certificates presented to the application when downloading content via HTTP. The flaw, which had been in the application since at least 2010, was eventually fixed in version 5.0.1, on October 28, 2024, more than 14 years later. It is not believed the flaw affected downloads using the BitTorrent protocol, however the application uses HTTP(s) to check for updates, download RSS feeds and manage its Internet geolocation database.

Some of the features present in qBittorrent include:

qBittorrent is cross-platform, available on many operating systems, including: FreeBSD, Linux, macOS, OS/2 (including ArcaOS and eComStation), and Windows.

As of July 2017, SourceForge statistics indicate that the most popular qBittorrent version of all supported platforms, 81% of downloads were for Windows computers.

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