Updated xulrunner packages that fix one security issue are now availablefor Red Hat Enterprise Linux 5 and 6.The Red Hat Security Response Team has rated this update as having criticalsecurity impact. A Common Vulnerability Scoring System base score,which gives a detailed severity rating, is available from the CVE link inthe References section. XULRunner provides the XUL Runtime environment for applications using theGecko layout engine.A flaw was found in the way XULRunner handled malformed web content. A webpage containing malicious content could cause an application linked againstXULRunner to crash or execute arbitrary code withthe privileges of the user running the application. Red Hat would like to thank the Mozilla project for reporting this issue.Upstream acknowledges VUPEN Security via the TippingPoint Zero DayInitiative project as the original reporter.For technical details regarding this flaw, refer to the Mozilla securityadvisories. You can find a link to the Mozilla advisories in the Referencessection of this erratum.All XULRunner users should upgrade to these updated packages, which correctthis issue. After installing the update, applications using XULRunner mustbe restarted for the changes to take effect.