DoS on invalid data stream (including ones of PNG files).
vulners.com/securityvulns/securityvulns:doc:18226
vulners.com/securityvulns/securityvulns:doc:18227
vulners.com/securityvulns/securityvulns:doc:18312
vulners.com/securityvulns/securityvulns:doc:9080
vulners.com/securityvulns/securityvulns:doc:9641