The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: graphviz 2.38.0-12ubuntu2.1+esm1 libcdt5 2.38.0-12ubuntu2.1+esm1 libcgraph6 2.38.0-12ubuntu2.1+esm1 libgvc6 2.38.0-12ubuntu2.1+esm1 libgvc6-plugins-gtk 2.38.0-12ubuntu2.1+esm1 libgvpr2 2.38.0-12ubuntu2.1+esm1 libpathplan4 2.38.0-12ubuntu2.1+esm1 libxdot4 2.38.0-12ubuntu2.1+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5264-1
CVE-2018-10196, CVE-2019-11023, CVE-2020-18032
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