Qemu through 2.10.0 allows remote attackers to cause a memory leak by triggering slow data-channel read operations, related to io/channel-websock.c.
https://access.redhat.com/errata/RHSA-2018:0816
https://access.redhat.com/errata/RHSA-2018:1104
https://bugs.launchpad.net/qemu/+bug/1718964
https://lists.gnu.org/archive/html/qemu-devel/2017-10/msg02278.html