Hello,
TL;RD: if you are a bridge operator please update obfs4proxy to a version>=0.0.12.
There is a new version of obfs4proxy (>=0.0.12) which fixes a security issue[0]. Tor Browser has already updated to the new version, which reduces a bit the security problem, but introduces a partial incompatibility between versions[1]. Because of that updating to the latest version greatly will help bridge users.
If you use debian you can find the latest version bullseye-backports[2]. If you use docker there is a new version of the official docker image that you can upgrade to[3].
Thank you for running bridges, let me know if you need any help upgrading it.
[0] https://lists.torproject.org/pipermail/anti-censorship-team/2022-January/000... [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/40804 [2] https://packages.debian.org/stable-backports/obfs4proxy [3] https://hub.docker.com/layers/thetorproject/obfs4-bridge/0.11/images/sha256-...