The XML parser (xmlparse.c) in expat before 2.1.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML file with many identifiers with the same value.
{
    "binaries": [
        {
            "binary_version": "3.20.1+git20120521-6build1",
            "binary_name": "insighttoolkit3-examples"
        },
        {
            "binary_version": "3.20.1+git20120521-6build1",
            "binary_name": "libinsighttoolkit3-dev"
        },
        {
            "binary_version": "3.20.1+git20120521-6build1",
            "binary_name": "libinsighttoolkit3.20"
        }
    ]
}{
    "binaries": [
        {
            "binary_version": "3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1",
            "binary_name": "libcoin80-dev"
        },
        {
            "binary_version": "3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1",
            "binary_name": "libcoin80-runtime"
        },
        {
            "binary_version": "3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1",
            "binary_name": "libcoin80v5"
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}