Two new stable Tor releases are out now: 0.4.2.6 and 0.4.1.8.
Tor 0.4.2.6 backports several bugfixes from 0.4.3.1-alpha, including some affecting the Linux seccomp2 sandbox or Windows services. If you're running one of those, you'll want to upgrade. https://blog.torproject.org/new-releases-tor-0426-0418
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