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The original report is [1].

Tomcat is affected when  accessing a form based security constrained
page or any page that calls javax.servlet.ServletRequest.getLocale() or
javax.servlet.ServletRequest.getLocales().

Work-arounds have been implemented in the following versions:
- - 7.0.8 (released)
- - 6.0.32 (released)
- - 5.5.33 (released expected Monday 7 Feb 2011)

All users are recommended to upgrade to a Tomcat version with the
work-around. Users unable to upgrade can filter malicious requests via a
Servlet filter, an httpd re-write rule (if Tomcat is behind an httpd
reverse proxy) or other filtering as available.

Accept-Language headers that are compliant with RFC 2616 can not trigger
this bug. Therefore, filtering out all request with non-compliant
headers will provide protection against the DOS vulnerability.

The Apache Tomcat Security Team


[1]
http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
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