The product uses a mechanism that automatically optimizes code, e.g. to improve a characteristic such as performance, but the optimizations can have an unintended side effect that might violate an intended security assumption.
The optimizations alter the order of execution resulting in side effects that were not intended by the original developer.
CVE-2017-5715Intel, ARM, and AMD processor optimizations related to speculative execution and branch prediction cause access control checks to be bypassed when placing data into the cache. Often known as "Spectre".
CVE-2008-1685C compiler optimization, as allowed by specifications, removes code that is used to perform checks to detect integer overflows.