libxkbcommon is vulnerable to denial of service (DoS). The vulnerability exists through a NULL pointer dereference in ExprResolveLhs.
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index
access.redhat.com/errata/RHSA-2019:2079
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1529419
bugzilla.redhat.com/show_bug.cgi?id=1624847
bugzilla.redhat.com/show_bug.cgi?id=1632807
bugzilla.redhat.com/show_bug.cgi?id=1635747
bugzilla.redhat.com/show_bug.cgi?id=1642197
bugzilla.redhat.com/show_bug.cgi?id=1648116
bugzilla.redhat.com/show_bug.cgi?id=1650166
bugzilla.redhat.com/show_bug.cgi?id=1650634
bugzilla.redhat.com/show_bug.cgi?id=1665433
bugzilla.redhat.com/show_bug.cgi?id=1674474
bugzilla.redhat.com/show_bug.cgi?id=1680120
bugzilla.redhat.com/show_bug.cgi?id=1724300
github.com/xkbcommon/libxkbcommon/commit/38e1766bc6e20108948aec8a0b222a4bad0254e9
lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html
security.gentoo.org/glsa/201810-05
usn.ubuntu.com/3786-1/
usn.ubuntu.com/3786-2/