The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: gthumb 3:3.8.0-2.1ubuntu0.1 gthumb-data 3:3.8.0-2.1ubuntu0.1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5680-1
CVE-2019-20326, CVE-2020-36427
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