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://www.debian.org/security/2018/dsa-4213
https://usn.ubuntu.com/3575-1/
https://lists.gnu.org/archive/html/qemu-devel/2017-10/msg02278.html
https://access.redhat.com/errata/RHSA-2018:1104