nginx 0.8.54Edit
From the official release announcement:
Changes with nginx 0.8.54 14 Dec 2010
*) Bugfix: if there was a single server for given IPv6 address:port
pair, then captures in regular expressions in a "server_name"
directive did not work.
*) Bugfix: a segmentation fault might occur in a worker process, if the
"auth_basic" directive was used.
Thanks to Michail Laletin.
*) Bugfix: compatibility with ngx_http_eval_module; the bug had
appeared in 0.8.42.