The get_repeat_type function in basic_regex_creator.hpp in the Boost regex library (aka Boost.Regex) in Boost 1.33 and 1.34 allows context-dependent attackers to cause a denial of service (NULL dereference and crash) via an invalid regular expression.
https://www.redhat.com/archives/fedora-package-announce/2008-January/msg00760.html
https://issues.rpath.com/browse/RPL-2143
http://www.vupen.com/english/advisories/2008/0249
http://www.ubuntu.com/usn/usn-570-1
http://www.securityfocus.com/bid/27325
http://www.securityfocus.com/archive/1/488102/100/0/threaded
http://www.mandriva.com/en/security/advisories?name=MDVSA-2008:032
http://www.gentoo.org/security/en/glsa/glsa-200802-08.xml
http://wiki.rpath.com/Advisories:rPSA-2008-0063
http://svn.boost.org/trac/boost/changeset/42745
http://svn.boost.org/trac/boost/changeset/42674
http://secunia.com/advisories/48099
http://secunia.com/advisories/29323
http://secunia.com/advisories/28943
http://secunia.com/advisories/28860
http://secunia.com/advisories/28705
http://secunia.com/advisories/28545
http://secunia.com/advisories/28527
http://secunia.com/advisories/28511
http://lists.opensuse.org/opensuse-security-announce/2008-03/msg00004.html