We just bumped to upstream's latest alpha release but that must not distract from their staunch warning:
"WARNING: This release is based on old WebKit revision with known unpatched vulnerabilities. Please use it carefully and avoid visiting untrusted websites and using it for transmission of sensitive data. Please wait for new release from qtwebkit-dev branch to use it with untrusted content."
See also: https://github.com/qtwebkit/qtwebkit/releases