Arti 2.5.0 released: Stable Counter Galois Onion | The Tor Project
Arti 2.5.0 released: Stable Counter Galois Onion
by cve<br>| June 30, 2026
Arti is our ongoing project to create a next-generation Tor implementation in<br>Rust. We're happy to announce the latest release, Arti 2.5.0.
This release marks Counter Galois Onion as a stable feature and includes it in<br>full feature builds. Likewise, Congestion Control is now enabled in default<br>builds of Arti, increasing the overall speed without any further configuration.
Unfortunately, this release also comes with the disclosure of two medium-severity<br>DoS security issues, TROVE-2026-024 as well as TROVE-2026-027, whose fixes<br>are of course included within the release.
Additionally, this release continues our ongoing development towards using<br>Arti as a relay and as a directory authority.
Another noteworthy change is that we've increased our minimum supported Rust<br>version to Rust 1.91, released in October 2025.
Of course, this release also contains a number of bugfixes, cleanups, and<br>improvements throughout various parts of the code base.
For full details on what we've done, including API changes,<br>and for information about many more minor and less-visible changes,<br>please see the CHANGELOG.
For more information on using Arti, see our top-level README,<br>and the documentation for the arti binary.
Thanks to everybody who's contributed to this release, including<br>5225225, Neel Chauhan, hjrgrn, moumenalaoui, pryty26.
Also, our deep thanks to our sponsors for funding the development of Arti!
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