{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.5.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8643d7be841184f766374e3b0ed68ced6391543c"
            },
            {
              "fixed": "9777bc5ce810d6c418a1473e9e8c40cdb0026e5a"
            },
            {
              "fixed": "b6bd975ccfac6aadf29b98e35e09114bef3840a9"
            }
          ],
          "repo": "https://github.com/wolfssl/wolfssh",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "wolfSSL",
    "cwe_ids": [
      "CWE-287",
      "CWE-613"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83540.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.4.15"
          },
          {
            "fixed": "1.6.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "When password or public key authentication is used with the Windows port of wolfSSHd, the Windows logon token acquired for one authenticated connection is not released before a token is acquired for a subsequent connection, resulting in user login poisoning between connections. A less privileged user with a valid account on the server can exploit this to force a login as a more privileged user. The vulnerability was introduced with the initial Windows port of wolfSSHd in wolfSSH version 1.4.15 and affects all versions through 1.5.0. Non-Windows builds of wolfSSHd are not affected.",
  "id": "CVE-2026-83540",
  "modified": "2026-10-08T02:31:01.566498603Z",
  "published": "2026-10-07T02:40:35.137Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83540.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83540"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wolfSSL/wolfssh/commit/9777bc5ce810d6c418a1473e9e8c40cdb0026e5a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wolfSSL/wolfssh/commit/b6bd975ccfac6aadf29b98e35e09114bef3840a9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wolfSSL/wolfssh"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "wolfSSHd on Windows race condition leading to logon token reused across connections"
}