A heap-based buffer over-read exists in the function dexpression1 in cp-demangle.c in GNU libiberty, as distributed in GNU Binutils 2.31.1. A crafted input can cause segmentation faults, leading to denial-of-service, as demonstrated by c++filt.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20712.json"