Security advisory

{
  "id": "1129c622ea16ce84e0ea86407355cd59b1c369c00d196a9fab6480d940cf931a",
  "url": "https://osv.dev/vulnerability/CVE-2026-11604",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-11604",
    "summary": "An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).",
    "evidence": "osv:CVE-2026-11604",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-11604",
      "aliases": [
        "CVE-2026-11604"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openvpn/ovpn-dco-win",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "435b881caab4e4303a23eb00b373eee3caf37903"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.8.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "cpe": "cpe:2.3:a:openvpn:ovpn-dco-win:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.8.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.8.3",
            "2.8.2",
            "2.8.0",
            "2.7.1",
            "2.7.0",
            "2.6.2",
            "2.6.1",
            "2.5.9",
            "2.5.6",
            "2.5.5",
            "2.5.4",
            "2.5.3",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "1.0.0",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.1",
            "0.9.0",
            "0.8.3",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.7.6",
            "0.7.4",
            "0.7.1",
            "0.6.8",
            "0.6.7",
            "0.6.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11604.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.093364381Z",
      "provider": "osv",
      "references": [
        "https://community.openvpn.net/Security%20Announcements/CVE-2026-11604",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11604.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-11604",
        "https://github.com/OpenVPN/ovpn-dco-win/releases"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-122",
          "CWE-131",
          "CWE-787"
        ],
        "cna_assigner": "OpenVPN",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.0.0"
                  },
                  {
                    "last_affected": "2.5.8"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11604.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-11604",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493829,
  "published_at": "2026-06-10T21:04:37.141+00:00"
}