Security advisory

{
  "id": "60bd9fc41a056962c8ccb62a3686415704cc95cd7c47efa6b92dfa0ec1afca0b",
  "url": "https://osv.dev/vulnerability/CVE-2018-19791",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-19791",
    "summary": "The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests for byte sequences, allowing an attacker to amplify the response size by requesting the entire response body repeatedly, as demonstrated by an HTTP Range header value beginning with the \"bytes=0-,0-\" substring.",
    "evidence": "osv:CVE-2018-19791",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-19791",
      "aliases": [
        "CVE-2018-19791"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/litespeedtech/openlitespeed",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f3fa070f9bef5bdbc10f72915701e86fd5a3b6c2"
                },
                {
                  "introduced": "f3fa070f9bef5bdbc10f72915701e86fd5a3b6c2"
                },
                {
                  "last_affected": "a71750f9a6d3ab3306b255ab4fc3a514adab6f2f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-NA"
                      },
                      {
                        "last_affected": "1.5.0-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-rc1"
                      },
                      {
                        "last_affected": "1.5.0-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-rc2"
                      },
                      {
                        "last_affected": "1.5.0-rc2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-rc3"
                      },
                      {
                        "last_affected": "1.5.0-rc3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc4:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-rc4"
                      },
                      {
                        "last_affected": "1.5.0-rc4"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc5:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0-rc5"
                      },
                      {
                        "last_affected": "1.5.0-rc5"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.5.0-NA",
            "1.5.0-rc1",
            "1.5.0-rc2",
            "1.5.0-rc3",
            "1.5.0-rc4",
            "1.5.0-rc5",
            "v1.5.0rc6",
            "v1.5.0rc5",
            "v1.5.0rc4",
            "v1.5.0rc3",
            "v1.5.0rc2",
            "v1.5.0rc1",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3",
            "v1.0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-19791.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:24.717469849Z",
      "provider": "osv",
      "references": [
        "https://github.com/litespeedtech/openlitespeed/issues/117"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-19791",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382549,
  "published_at": "2018-12-03T06:29:00.4+00:00"
}