Security advisory

{
  "id": "87999f65900a343ff526ba4382f880b92ee78560820218b9a1bf4daa3c4977f7",
  "url": "https://osv.dev/vulnerability/CVE-2026-31309",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-31309",
    "summary": "Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.",
    "evidence": "osv:CVE-2026-31309",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-31309",
      "aliases": [
        "CVE-2026-31309"
      ],
      "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/mysteriumnetwork/node",
              "type": "GIT",
              "events": [
                {
                  "introduced": "043c542056e0868221f2c607ec6e6bb6ec2c8bed"
                },
                {
                  "fixed": "b69dd4a2c5d1244e4c6e96517c21ccc9b4ea3567"
                },
                {
                  "fixed": "bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.21.1-rc0"
                      },
                      {
                        "fixed": "1.36.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.35.5",
            "1.35.4",
            "1.35.3",
            "1.35.2",
            "1.35.1",
            "1.35.0",
            "1.34.1",
            "1.34.0",
            "1.33.10",
            "1.33.9",
            "1.33.8",
            "1.33.5",
            "1.33.7",
            "1.33.6",
            "1.33.4",
            "1.33.2",
            "1.33.1",
            "1.33.0",
            "1.32.3",
            "1.32.2",
            "1.32.1",
            "1.32.0",
            "1.31.4",
            "1.31.3",
            "1.31.2",
            "1.31.1",
            "1.31.0",
            "1.30.3",
            "1.30.2",
            "1.30.1",
            "1.30.0",
            "1.29.23",
            "1.29.22",
            "1.29.21",
            "1.29.20",
            "1.29.19",
            "1.29.18",
            "1.29.17",
            "1.29.16",
            "1.29.15",
            "1.29.14",
            "1.29.13",
            "1.29.12",
            "1.29.11",
            "1.29.10",
            "1.29.9",
            "1.29.9-rc1",
            "1.29.8",
            "1.29.7",
            "1.29.6",
            "1.29.4",
            "1.29.5",
            "1.29.3",
            "1.29.2",
            "1.29.2-rc4",
            "1.29.2-rc3",
            "1.29.2-rc2",
            "1.29.2-rc1",
            "1.29.1",
            "1.29.0",
            "1.28.0",
            "1.27.0",
            "1.26.0",
            "1.25.5",
            "1.25.4",
            "1.25.3",
            "1.25.2",
            "1.25.1",
            "1.25.0",
            "1.24.0",
            "1.24.0-rc15",
            "1.23.0",
            "1.22.1",
            "1.22.0",
            "1.21.1-rc0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31309.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.686350154Z",
      "provider": "osv",
      "references": [
        "https://github.com/mysteriumnetwork/node/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31309.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31309",
        "https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9",
        "https://github.com/sch8ill/CVE-2026-31309"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31309.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31309",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500964,
  "published_at": "2026-07-08T00:00:00+00:00"
}