The MITRE CVE dictionary describes this issue as:
libdns in ISC BIND 9.7.x and 9.8.x before 9.8.4-P2, 9.8.5 before 9.8.5b2, 9.9.x before 9.9.2-P2, and 9.9.3 before 9.9.3b2 on UNIX platforms allows remote attackers to cause a denial of service (memory consumption) via a crafted regular expression, as demonstrated by a memory-exhaustion attack against a machine running a named process.
Find out more about CVE-2013-2266 from the
MITRE CVE dictionary dictionary and
This issue did not affect the versions of bind package as shipped with Red Hat Enterprise Linux 3, 4, and 5. This issue was corrected in bind97 packages in Red Hat Enterprise Linux 5 and bind packages in Red Hat Enterprise Linux 6.