The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: pngcheck 2.3.0-7ubuntu0.20.04.1 Ubuntu 18.04 LTS (Available with Ubuntu Pro): pngcheck 2.3.0-7ubuntu0.18.04.1~esm1 Ubuntu 16.04 LTS (Available with Ubuntu Pro): pngcheck 2.3.0-7ubuntu0.16.04.1~esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-6182-1
CVE-2020-27818, CVE-2020-35511
https://launchpad.net/ubuntu/+source/pngcheck/2.3.0-7ubuntu0.20.04.1
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