Security advisory

{
  "id": "865090b4b7926cfb38d0d22def0a3c9539b1acf6ee81ca9759f9b72f75414ed4",
  "url": "https://osv.dev/vulnerability/CVE-2021-31819",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-31819",
    "summary": "In Halibut versions prior to 4.4.7 there is a deserialisation vulnerability that could allow remote code execution on systems that already trust each other based on certificate verification.",
    "evidence": "osv:CVE-2021-31819",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-31819",
      "aliases": [
        "CVE-2021-31819",
        "GHSA-hpf7-4c2g-9chf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/octopusdeploy/halibut",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b325aeb4cce5a9ff0b663c67ccabb3bd5d04cb34"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:octopus:halibut:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.4.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.4.6",
            "4.4.5",
            "4.4.4",
            "4.4.3",
            "4.4.2",
            "4.4.1",
            "4.4.0",
            "4.3.34",
            "4.3.33",
            "4.3.32",
            "4.3.31",
            "4.3.30-ci0009",
            "4.3.30-ci0007",
            "4.3.30-ci0005",
            "4.3.30-ci0003",
            "4.3.28-ci0001",
            "4.3.28",
            "4.3.30-ci0001",
            "4.3.29-ci0002",
            "4.3.29",
            "4.3.29-ci0001",
            "4.3.27-ci0003",
            "4.3.27",
            "4.3.27-ci0002",
            "4.3.27-ci0001",
            "4.3.26-ci0002",
            "4.3.26",
            "4.3.26-ci0001",
            "4.3.25",
            "4.3.24",
            "4.3.23",
            "4.3.22",
            "4.3.21",
            "4.3.19",
            "4.3.18",
            "4.3.17",
            "4.3.16",
            "4.3.15",
            "4.3.14",
            "4.3.13",
            "4.3.12",
            "4.3.8",
            "4.3.7",
            "4.3.6",
            "4.3.5",
            "4.3.3",
            "4.3.4",
            "4.3.2",
            "4.3.0",
            "4.2.11",
            "4.3.1",
            "4.2.9",
            "4.2.8",
            "4.2.7",
            "4.2.4",
            "4.2.3",
            "4.2.2",
            "4.2.1",
            "4.2.0",
            "4.1.0",
            "4.0.9",
            "4.0.8",
            "4.0.7",
            "4.0.6",
            "4.0.5",
            "4.0.4",
            "4.0.3",
            "4.0.2",
            "4.0.1",
            "4.0.0",
            "3.0.4",
            "3.0.2",
            "3.0.0",
            "2.6.19",
            "2.6.15",
            "2.6.14",
            "2.6.13",
            "2.6.12",
            "2.6.8",
            "2.6.6",
            "2.6.4",
            "2.6.3",
            "2.6.2",
            "2.6.1",
            "2.6.0",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "2.4.19",
            "2.4.18",
            "2.4.17",
            "2.4.15",
            "2.4.14",
            "2.4.13",
            "2.4.12",
            "2.4.11",
            "2.4.10",
            "2.4.9",
            "2.4.8",
            "2.4.4",
            "2.4.3",
            "2.4.2",
            "2.4.1",
            "2.4.0",
            "2.3.0",
            "2.2.1",
            "2.2.0.55"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-31819.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:04.649632098Z",
      "provider": "osv",
      "references": [
        "https://advisories.octopus.com/adv/2021-08---Remote-Code-Execution-via-Deserialisation-in-the-Halibut-Protocol-%28CVE-2021-31819%29.2250309681.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-31819",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440572,
  "published_at": "2021-09-22T02:15:09.593+00:00"
}