Directory traversal vulnerability in HServer 0.1.1 allows remote attackers to read arbitrary files via a (1) ..%5c (dot dot encoded backslash) or (2) %2e%2e%5c (encoded dot dot backslash) in the PATH_INFO.
https://exchange.xforce.ibmcloud.com/vulnerabilities/72138
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-5023
http://www.securityfocus.com/bid/51286
http://archives.neohapsis.com/archives/bugtraq/2012-01/0028.html