Escape sequence injection vulnerability in the Basic authentication of WEBrick

There is an escape sequence injection vulnerability in the Basic
authentication of WEBrick bundled by Ruby.

When using the Basic authentication of WEBrick, clients can pass an
arbitrary string as the user name. WEBrick outputs the passed user name
intact to its log, then an attacker can inject malicious escape sequences to
the log and dangerous control characters may be executed on a victim’s
terminal emulator.

This vulnerability is similar to a vulnerability already fixed, but it had
not been fixed in the Basic authentication.

All users running an affected release should upgrade immediately.