Stack-based buffer overflow in the Java Web Start command launcher in Java for Mac OS X 10.5 before Update 5 allows attackers to execute arbitrary code or cause a denial of service (application crash) via unspecified vectors.

The Sun Java Plugin capability in Java 2 Runtime Environment (JRE) 1.4.2_01, 1.4.2_04, and possibly earlier versions, does not properly restrict access between Javascript and Java applets during data transfer, which allows remote attackers to load unsafe classes and execute arbitrary code by using the reflection API to access private Java packages.