nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption.
Acknowledgments: Name: the Nginx project
Ansible Tower is not enabling neither using http2 within the nginx configuration file, so it is not affected.
Already did some research and discuss with Satoe I. from CloudForms. CFME is not using in any way nginx more than the inclusion from Ansible Tower (not changed or altered configuration or used outside from Tower), and Ansible Tower is not affected, so CloudForms is also not affected; updating the task accordingly.
External Reference: http://mailman.nginx.org/pipermail/nginx-announce/2018/000220.html
Created nginx tracking bugs for this issue: Affects: epel-all [bug 1647261] Affects: fedora-all [bug 1647259]
Upstream patch: http://hg.nginx.org/nginx/rev/1c6b6163c039
Statement: This issue did not affect the versions of rh-nginx18-nginx as shipped with Red Hat Software Collections as they did not include the vulnerable module ngx_http_v2_module.
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Red Hat Software Collections for Red Hat Enterprise Linux 6 Via RHSA-2018:3653 https://access.redhat.com/errata/RHSA-2018:3653
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Via RHSA-2018:3680 https://access.redhat.com/errata/RHSA-2018:3680
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Via RHSA-2018:3681 https://access.redhat.com/errata/RHSA-2018:3681