A vulnerability was discovered and corrected in xulrunner:

Unspecified vulnerability in Mozilla Firefox 3.5.x through 3.5.14
and 3.6.x through 3.6.11, when JavaScript is enabled, allows remote
attackers to execute arbitrary code via unknown vectors, as exploited
in the wild in October 2010 by the Belmoo malware (CVE-2010-3765).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct this issue.