The author has announced an indefinite hiatus in its development, noting that any reported security vulnerabilities may go unaddressed for prolonged periods of time.

Update: security maintenance only

After this advisory was published, the author graciously agreed to give access to the rustls team. The rustls team is committed to providing security (only) maintenance for ring for the foreseeable future.

Update: back to normal

Things are more-or-less back to how they were before, and in particular the situation isn't "security maintenance only."