CVE-2018-10887: Out-of-bounds Read

A flaw was found in libgit2 which is wrapped by the rugged gem. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out-of-bound read, which allows reading before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.