Security advisory

{
  "id": "127b1cd9915f61e1e291b70cf424a7476a24e31d95cb57e1b885195b918e5833",
  "url": "https://osv.dev/vulnerability/CVE-2018-6335",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-6335",
    "summary": "A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.",
    "evidence": "osv:CVE-2018-6335",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-6335",
      "aliases": [
        "CVE-2018-6335"
      ],
      "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/facebook/hhvm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "fff094b066f4780b175befeb9ba949f9dcf73d8c"
                },
                {
                  "introduced": "5f227331c426ef58513feb5c92ffd0a705067b2f"
                },
                {
                  "last_affected": "95ec9d36f4b1bc49e70c0752ce4b531f27a1429a"
                },
                {
                  "fixed": "4cb57dd753a339654ca464c139db9871fe961d56"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.21.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:facebook:hhvm:3.24.6:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.24.6"
                      },
                      {
                        "last_affected": "3.24.6"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:facebook:hhvm:3.25.2:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.25.2"
                      },
                      {
                        "last_affected": "3.25.2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4cb57dd753a339654ca464c139db9871fe961d56"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.24.6",
            "3.25.2",
            "HHVM-3.21.10",
            "HHVM-3.25.2",
            "HHVM-3.25.1",
            "HHVM-3.21.9",
            "HHVM-3.25.0",
            "HHVM-3.21.8",
            "HHVM-3.21.7",
            "HHVM-3.21.6",
            "HHVM-3.21.5",
            "HHVM-3.21.4",
            "HHVM-3.21.3",
            "HHVM-3.21.2",
            "HHVM-3.21.1",
            "HHVM-3.21.0",
            "gcc-4.6",
            "HPHP-2.1.0",
            "src-hphp",
            "pre-hhvm"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6335.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:55.433164844Z",
      "provider": "osv",
      "references": [
        "https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html",
        "https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-6335",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380987,
  "published_at": "2018-12-31T19:29:00.417+00:00"
}