Apple has released another set of Mac OS X bug fixes. The latest security updates fix 11 bugs in the Mac Operating system, including eight bugs in the recently released Mac OS X 10.5, known as "Leopard."

Apple released the security fixes in conjunction with a 10.5.2 update to Leopard, which includes dozens of other updates.

Some of the security flaws are extremely serious, and could be exploited by hackers to run unauthorised software on a victim's computer, although Apple did not report any incidents of this occurring.

The patches include fixes for Safari, Mail, Launch Services, the Mac OS Directory Services, Open Directory and Parental Controls. There are also patches for several Unix components that ship with Apple's software, including a recently patched flaw in the Samba file-and-print software.

"The Samba bug was expected, since all the open-source distributions released fixes a while ago," said Andrew Storms, nCircle's director of security operations.

This is the second batch of fixes within the last two months. Apple released 41 patches for OS X in December.