About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
Released December 4, 2017
Available for: macOS Sierra 10.12.6 or later
Impact: Compiling with untrusted sources may lead to arbitrary code execution with user privileges
Description: A buffer overflow was addressed with improved bounds checking.
CVE-2017-7167: sss of Qihoo 360 Nirvan Team