HAProxy through 2.0.2 allows attackers to cause a denial of service (ha_panic) via vectors related to htx_manage_client_side_cookies in proto_htx.c.
https://github.com/haproxy/haproxy/issues/181
http://www.securityfocus.com/bid/109352
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00062.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00060.html