The MITRE CVE dictionary describes this issue as:
stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.
Find out more about CVE-2018-11236 from the
MITRE CVE dictionary dictionary and
Red Hat Product Security has rated this issue as having a security impact of Moderate, and a future update may address this flaw.