Adobe has released Adobe Reader and Adobe Acrobat 9.4.1, an update that fixes issues including several critical security issues that affect Windows, Macintosh, and UNIX systems. The critical security issues
could, if exploited, cause the application to crash and could potentially allow an attacker to take control of the affected system.
Note that the UNIX version of the Adobe Reader 9.4.1 update is expected to be available on November 30, 2010.
More information is available here: