CERT announcement Today. Here is one set about SNORT
Multiple Vulnerabilities in Snort Preprocessors

There are two vulnerabilities in the Snort Intrusion Detection
System, each in a separate preprocessor module. Both
vulnerabilities allow remote attackers to execute arbitrary code
with the privileges of the user running Snort, typically root

CERT Advisory CA-2003-13: Multiple Vulnerabilities in
Snort Preprocessors
http://www.cert.org/advisories/CA-2003-13.html

Vulnerability Note VU#139129: Heap overflow in Snort
"stream4" preprocessor
http://www.kb.cert.org/vuls/id/139129

Vulnerability Note VU#916785: Buffer overflow in Snort
RPC preprocessor
http://www.kb.cert.org/vuls/id/916785