Directory traversal vulnerability in the BOM (aka Bill of Materials) component in Apple iOS before 9.1, OS X before 10.11.1, and watchOS before 2.0.1 allows remote attackers to execute arbitrary code via a crafted CPIO archive.
Apple Security Advisory 2015-10-21-2 - watchOS 2.0.1 is now available and addresses arbitrary code execution, heap buffer overflow, and various other vulnerabilities.