jsinfer.cpp in Mozilla Firefox ESR 10.x before 10.0.5 and Thunderbird ESR 10.x before 10.0.5 does not properly determine data types, which allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via crafted JavaScript code.
https://bugzilla.mozilla.org/show_bug.cgi?id=748613
http://www.mozilla.org/security/announce/2012/mfsa2012-34.html
http://www.mandriva.com/security/advisories?name=MDVSA-2012:088
http://www.debian.org/security/2012/dsa-2499
http://rhn.redhat.com/errata/RHSA-2012-0715.html
http://rhn.redhat.com/errata/RHSA-2012-0710.html
http://lists.opensuse.org/opensuse-security-announce/2012-06/msg00012.html