It was discovered that json-c incorrectly handled certain JSON files. An attacker could possibly use this issue to execute arbitrary code.
{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libjson-c-dev",
            "binary_version": "0.11-3ubuntu1.2+esm1"
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        {
            "binary_name": "libjson-c2",
            "binary_version": "0.11-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libjson0",
            "binary_version": "0.11-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libjson0-dev",
            "binary_version": "0.11-3ubuntu1.2+esm1"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libjson-c-dev",
            "binary_version": "0.11-4ubuntu2.1"
        },
        {
            "binary_name": "libjson-c2",
            "binary_version": "0.11-4ubuntu2.1"
        },
        {
            "binary_name": "libjson0",
            "binary_version": "0.11-4ubuntu2.1"
        },
        {
            "binary_name": "libjson0-dev",
            "binary_version": "0.11-4ubuntu2.1"
        }
    ]
}