A haproxy bugfix update has been released for CentOS 7.

CEBA-2021:2326 CentOS 7 haproxy BugFix Update

CentOS Errata and Bugfix Advisory 2021:2326

Upstream details at :   https://access.redhat.com/errata/RHBA-2021:2326

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
f94ef4ce18a021edb2b5a72fc87092d88e8c7b4aac3c605213fea20cdeefb002 haproxy-1.5.18-9.el7_9.1.x86_64.rpm

Source:
72d02dd424f662560a7089dbfe26589095ab51092384c9916cf015ff8e00191b haproxy-1.5.18-9.el7_9.1.src.rpm