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Test your applicationsUpgrade RHEL:7 cairo to version 0:1.15.12-3.el7 or higher.
This issue was patched in RHSA-2018:3140.
Note: Versions mentioned in the description apply only to the upstream cairo package and not the cairo package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
WebCore/platform/network/soup/SocketStreamHandleImplSoup.cpp in the libsoup network backend of WebKit, as used in WebKitGTK+ prior to version 2.20.0 or without libsoup 2.62.0, unexpectedly failed to use system proxy settings for WebSocket connections. As a result, users could be deanonymized by crafted web sites via a WebSocket connection.