A Bleichenbacher type side-channel based padding oracle attack was found in the way nettle handles endian conversion of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run a process on the same physical core as the victim process, could use this flaw extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.
{
    "binaries": [
        {
            "binary_name": "libhogweed2",
            "binary_version": "2.7.1-1ubuntu0.2"
        },
        {
            "binary_name": "libnettle4",
            "binary_version": "2.7.1-1ubuntu0.2"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "2.7.1-1ubuntu0.2"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "2.7.1-1ubuntu0.2"
        }
    ]
}
          {
    "binaries": [
        {
            "binary_name": "libhogweed4",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "libnettle6",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libhogweed4",
            "binary_version": "3.4.1-0ubuntu0.18.04.1"
        },
        {
            "binary_name": "libnettle6",
            "binary_version": "3.4.1-0ubuntu0.18.04.1"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "3.4.1-0ubuntu0.18.04.1"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "3.4.1-0ubuntu0.18.04.1"
        }
    ]
}