Security advisory

{
  "id": "df4e15e3ffceeffdf392f1b35ed8ee6f2aef11f69ffc979d2dbcdcb3aa20c6f7",
  "url": "https://osv.dev/vulnerability/CVE-2019-16770",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-16770",
    "summary": "In Puma before versions 3.12.2 and 4.3.1, a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough. This vulnerability is patched in Puma 4.3.1 and 3.12.2.",
    "evidence": "osv:CVE-2019-16770",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-16770",
      "aliases": [
        "CVE-2019-16770",
        "GHSA-7xx3-m584-x994"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/puma/puma",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f0762d1216c825009a5d3d0a13d1d3ec1ff95682"
                },
                {
                  "fixed": "bb29fc7fe8f822d0f72706a1ae86e49af3476777"
                },
                {
                  "introduced": "f5d7600e4e4d9104803b5f0f5f596f8dc45fc191"
                },
                {
                  "fixed": "2986bc4ab5e03072d4c09739649c5c9221b13c8d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.12.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.12.1",
            "v4.3.0",
            "v4.2.1",
            "v4.2.0",
            "v4.1.0",
            "v4.0.1",
            "v4.0.0",
            "v3.12.0",
            "v3.11.4",
            "v3.11.3",
            "v3.11.2",
            "v3.11.1",
            "v3.11.0",
            "v3.10.0",
            "v3.9.1",
            "v3.9.0",
            "v3.8.0",
            "v3.7.1",
            "v3.6.0",
            "v3.5.2",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.0",
            "v3.2.0",
            "v3.1.1",
            "v3.1.0",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-16770.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:27.540054520Z",
      "provider": "osv",
      "references": [
        "https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994",
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00034.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-16770",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383654,
  "published_at": "2019-12-05T20:15:10.093+00:00"
}