A new xine-lib package fixes some regression issues which could affect the security of the application. Further info is at: http://sourceforge.net/project/shownotes.php?release_id=653149&group_id=9655
There is no CERT or CVE issued at this point so the level of vulnerability is probably low.UPDATE:
New packages for VL 5.9/VL 5.9.1 and VL 6.0 are in the testing repositories for each version. These packages will be moved to the patches repositories as soon as we have had adequate user testing.