{
  "affected": [
    {
      "ranges": [
        {
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            "versions": [
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                "introduced": "0"
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                "last_affected": "1.11.0"
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            },
            {
              "introduced": "0"
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            {
              "last_affected": "e95ef6bc43daeda16451ad4ef20979d8e07a5299"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "bf169f9d3c8f4c682650c5390c088a4898940913"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "e349fb6139e4b7a59a9a359be0ea45dd61e589c5"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "7a12f379e47a9f7cf7211c727fe8fc70b6a0a9ab"
            },
            {
              "fixed": "afc39bea36fd436e54262f150c009e8d72db5014"
            }
          ],
          "repo": "https://github.com/envoyproxy/envoy",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.",
  "id": "CVE-2019-15226",
  "modified": "2026-03-13T21:57:43.096069016Z",
  "published": "2019-10-09T16:15:14.687Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/envoyproxy/envoy/commits/master"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/envoyproxy/envoy/issues/8520"
    },
    {
      "type": "FIX",
      "url": "https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}