In Qt through 5.14.1, the WebSocket implementation accepts up to 2GB for frames and 2GB for messages. Smaller limits cannot be configured. This makes it easier for attackers to cause a denial of service (memory consumption). Upstream Issue: https://bugreports.qt.io/browse/QTBUG-70693 Upstream Fix: https://codereview.qt-project.org/c/qt/qtwebsockets/+/284735
Created qt5-qtwebsockets tracking bugs for this issue: Affects: epel-6 [bug 1810966] Affects: fedora-all [bug 1810965]
Upstream commit for this issue: https://codereview.qt-project.org/gitweb?p=qt%2Fqtwebsockets.git;a=commit;h=ed93680f34e92ad0383aa4e610bb65689118ca93
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2018-21035
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4690 https://access.redhat.com/errata/RHSA-2020:4690