Lookup for vulnerabilities affecting packages.

GET /api/vulnerabilities/87944?format=api
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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/87944?format=api",
    "vulnerability_id": "VCID-be19-1hme-s7aq",
    "summary": "kernel: e1000 issue reported at 26c3",
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