Security advisory

{
  "id": "4c2b1abc3456f5a7a937ce63f85ae63c73d936bc373d980076a8a88293fdc1cc",
  "url": "https://osv.dev/vulnerability/CVE-2026-40215",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-40215",
    "summary": "A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.",
    "evidence": "osv:CVE-2026-40215",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-40215",
      "aliases": [
        "CVE-2026-40215"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openvpn/openvpn",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b999466418dddb89721be5455f03bacd9b221b1d"
                },
                {
                  "fixed": "8e87f2c34a0fbd64e282711582b106f84660e916"
                },
                {
                  "introduced": "ee1577744fb09af760dc319d57746e6abc55db85"
                },
                {
                  "fixed": "59748789497afcad90601d120fecd58cbc1423c4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.6.0"
                      },
                      {
                        "fixed": "2.6.20"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.7"
                      },
                      {
                        "fixed": "2.7.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.7.1",
            "v2.6.19",
            "v2.7.0",
            "v2.6.18",
            "v2.6.17",
            "v2.6.16",
            "v2.6.15",
            "v2.6.14",
            "v2.6.13",
            "v2.6.12",
            "v2.6.11",
            "v2.6.10",
            "v2.6.9",
            "v2.6.8",
            "v2.6.7",
            "v2.6.6",
            "v2.6.5",
            "v2.6.4",
            "v2.6.3",
            "v2.6.2",
            "v2.6.1",
            "v2.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40215.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.268587675Z",
      "provider": "osv",
      "references": [
        "https://community.openvpn.net/ReleaseHistory#openvpn-2620-released-22-april-2026",
        "https://community.openvpn.net/ReleaseHistory#openvpn-272-released-22-april-2026",
        "https://community.openvpn.net/Security%20Announcements/CVE-2026-40215",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40215.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40215"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125",
          "CWE-416"
        ],
        "cna_assigner": "OpenVPN",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.6.0"
                  },
                  {
                    "last_affected": "2.6.19"
                  },
                  {
                    "introduced": "2.7_alpha1"
                  },
                  {
                    "last_affected": "2.7.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40215.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40215",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513403,
  "published_at": "2026-06-08T19:59:20.481+00:00"
}