{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:tunnelblick:tunnelblick:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:tunnelblick:tunnelblick:8.1:beta01:*:*:*:*:*:*",
              "cpe:2.3:a:tunnelblick:tunnelblick:8.1:beta02:*:*:*:*:*:*",
              "cpe:2.3:a:tunnelblick:tunnelblick:8.1:beta03:*:*:*:*:*:*",
              "cpe:2.3:a:tunnelblick:tunnelblick:9.0:beta01:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "3.5.3"
              },
              {
                "fixed": "8.0.1"
              },
              {
                "introduced": "8.1-beta01"
              },
              {
                "last_affected": "8.1-beta01"
              },
              {
                "introduced": "8.1-beta02"
              },
              {
                "last_affected": "8.1-beta02"
              },
              {
                "introduced": "8.1-beta03"
              },
              {
                "last_affected": "8.1-beta03"
              },
              {
                "introduced": "9.0-beta01"
              },
              {
                "last_affected": "9.0-beta01"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "553e3e99f73ad93620a37c87408c5d0838964310"
            },
            {
              "fixed": "ba7d57c175c61caceb7faa66ca0bcc4d69ce0c77"
            },
            {
              "introduced": "238dd15970955abe6f1b00208729ae2f9dd9c0e8"
            },
            {
              "fixed": "035668b12ec19bfb1685cdb871f377314eb9255d"
            }
          ],
          "repo": "https://github.com/tunnelblick/tunnelblick",
          "type": "GIT"
        }
      ],
      "versions": [
        "8.1-beta01",
        "8.1-beta02",
        "8.1-beta03",
        "9.0-beta01"
      ]
    }
  ],
  "aliases": [
    "GHSA-927j-vcjf-hq69"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-61"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31893.json"
  },
  "details": "Tunnelblick is an open source graphic user interface for OpenVPN on macOS. In versions 3.3beta26 through 9.0beta01, any local user can read arbitrary root-owned files by exploiting a symlink following vulnerability in tunnelblick-helper, reachable through the world-accessible tunnelblickd Unix socket. The socket is configured with mode 0666, allowing any local user to connect. No authorization check is performed on the connecting client. The tunnelblick-helper process constructs a path to config.ovpn inside a user-controlled .tblk directory and reads it as root without symlink validation. An attacker can create a .tblk configuration with a symlinked config.ovpn pointing to any file and request tunnelblickd to read it. This issue has been fixed in versions 9.0beta02.",
  "id": "CVE-2026-31893",
  "modified": "2026-07-08T05:39:30.106090404Z",
  "published": "2026-05-05T18:55:41.737Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Tunnelblick/Tunnelblick/releases/tag/v9.0beta02"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31893.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Tunnelblick/Tunnelblick/security/advisories/GHSA-927j-vcjf-hq69"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31893"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Tunnelblick arbitrary file read via symlink following in tunnelblickd"
}