Security advisory

{
  "id": "c1836f2ebdf01995feb17eaa8e676ff44cfc1b4fca2d3398e802623571f2c7dc",
  "url": "https://osv.dev/vulnerability/CVE-2019-11636",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-11636",
    "summary": "Zcash 2.x allows an inexpensive approach to \"fill all transactions of all blocks\" and \"prevent any real transaction from occurring\" via a \"Sapling Wood-Chipper\" attack.",
    "evidence": "osv:CVE-2019-11636",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-11636",
      "aliases": [
        "CVE-2019-11636"
      ],
      "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/zcash/zcash",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d960b75de02097c806afb1a2d4982a5f85caf4e1"
                },
                {
                  "last_affected": "be1d68ef763ce405d4d04d7f4d3dfbbdd9084687"
                },
                {
                  "introduced": "910b1ea2ad4edf8b1442ee8e85af4adc2fbfc4e8"
                },
                {
                  "last_affected": "910b1ea2ad4edf8b1442ee8e85af4adc2fbfc4e8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:z.cash:zcash:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.0.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:z.cash:zcash:2.0.5:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.5-rc1"
                      },
                      {
                        "last_affected": "2.0.5-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.5-rc1",
            "v2.0.3-rc1",
            "v2.0.5-rc1",
            "v2.0.4-rc1",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2-rc1",
            "v2.0.2",
            "v2.0.1",
            "v2.0.1-rc1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-11636.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:19.159682081Z",
      "provider": "osv",
      "references": [
        "https://saplingwoodchipper.github.io",
        "https://github.com/zcash/zcash/issues/3955",
        "https://twitter.com/dukeleto/status/1120467430118232066"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-11636",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383551,
  "published_at": "2019-05-01T17:29:00.23+00:00"
}