{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0.29.0"
              },
              {
                "last_affected": "2017.04.03.00"
              }
            ]
          },
          "events": [
            {
              "introduced": "ad1f5dc3c90d6215e322360d77bbd920f846d27b"
            },
            {
              "last_affected": "ce3fed75c6336befb65a3ccda22ab2157ec03d21"
            },
            {
              "fixed": "f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f"
            }
          ],
          "repo": "https://github.com/facebook/proxygen",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.",
  "id": "CVE-2019-11940",
  "modified": "2026-03-13T21:51:36.028757455Z",
  "published": "2019-12-04T17:16:43.773Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.facebook.com/security/advisories/cve-2019-11940"
    },
    {
      "type": "FIX",
      "url": "https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}