A flaw was discovered in the HPACK decoder of HAProxy, before 1.8.14, that is used for HTTP/2. An out-of-bounds read access in hpack_valid_idx() resulted in a remote crash and denial of service.
https://www.mail-archive.com/haproxy%40formilux.org/msg31253.html
https://usn.ubuntu.com/3780-1/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14645