{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "2.0.0"
              },
              {
                "last_affected": "2.0.3"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.1.0"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.1.0-beta1"
              }
            ]
          },
          "events": [
            {
              "introduced": "788d3dcf683f65acc43a0dd81a75d697574b7656"
            },
            {
              "last_affected": "469cc4b3741f4d156cc9495d892861a6cb298777"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "f0f401faca3594c036503e613f3979101f3fd7f9"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "94a68eb27af6f69b8ea0e849fb8fc7d2554646da"
            }
          ],
          "repo": "https://github.com/h2o/h2o",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.",
  "id": "CVE-2016-4864",
  "modified": "2026-03-13T21:47:07.152864952Z",
  "published": "2017-05-12T18:29:00.437Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://jvn.jp/en/jp/JVN94779084/index.html"
    },
    {
      "type": "FIX",
      "url": "https://github.com/h2o/h2o/issues/1077"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}