http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-1661 "Perl-Compatible Regular Expression (PCRE) library before 7.3 backtracks too far when matching certain input bytes against some regex patterns in non-UTF-8 mode, which allows context-dependent attackers to obtain sensitive information or cause a denial of service (crash), as demonstrated by the "\X?\d" and "\P{L}?\d" patterns." F7 ships pcre 7.0.
pcre-7.3-3.fc7 has been submitted as an update for Fedora 7
pcre-7.3-3.fc7 has been pushed to the Fedora 7 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update pcre'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F7/FEDORA-2008-1842
pcre-7.3-3.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.