Security advisory

{
  "id": "ccb7f6bfbc1b319868df55beae7e992e9d7ad00f5f29a2eed90c65ea09c877a2",
  "url": "https://osv.dev/vulnerability/CVE-2016-4864",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-4864",
    "summary": "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.",
    "evidence": "osv:CVE-2016-4864",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2016-4864",
      "aliases": [
        "CVE-2016-4864"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/h2o/h2o",
              "type": "GIT",
              "events": [
                {
                  "introduced": "788d3dcf683f65acc43a0dd81a75d697574b7656"
                },
                {
                  "last_affected": "469cc4b3741f4d156cc9495d892861a6cb298777"
                },
                {
                  "introduced": "f0f401faca3594c036503e613f3979101f3fd7f9"
                },
                {
                  "last_affected": "94a68eb27af6f69b8ea0e849fb8fc7d2554646da"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:dena:h2o:2.1.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.1.0"
                      },
                      {
                        "last_affected": "2.1.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:dena:h2o:2.1.0:beta1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.1.0-beta1"
                      },
                      {
                        "last_affected": "2.1.0-beta1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.1.0",
            "2.1.0-beta1",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-4864.json"
          }
        }
      ],
      "modified": "2026-10-20T10:47:30.259064407Z",
      "provider": "osv",
      "references": [
        "https://jvn.jp/en/jp/JVN94779084/index.html",
        "https://github.com/h2o/h2o/issues/1077"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2016-4864",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 379443,
  "published_at": "2017-05-12T18:29:00.437+00:00"
}