Apple has released iTunes 9.0.1 to address a vulnerability that may allow an attacker to execute arbitrary code or cause a denial-of-service condition.

iTunes 9.0.1

• iTunesCVE-ID: CVE-2009-2817Available for: Mac OS X v10.4.11 or later, Mac OS X Server v10.4.11 or later, Windows XP, Vista, Windows 7

  Impact: Opening a maliciously crafted .pls file may lead to an unexpected application termination or arbitrary code execution

  Description: A buffer overflow exists in the handling of .pls files. Opening a maliciously crafted .pls file may lead to an unexpected application termination or arbitrary code execution. This update addresses the issue through improved bounds checking. Credit to Steven Woolley at Oogli LLC for reporting this issue.

http://support.apple.com/kb/HT3884