{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.4.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a2bd9be184a94997105ce190dad920c41e7b10df"
            },
            {
              "fixed": "3ca1ef34bb371bb0c76ca1b392e56c8a1c98ceb8"
            }
          ],
          "repo": "https://github.com/liketrek/trek",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9hpq-mrpx-mcxg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85738.json"
  },
  "details": "TREK is a collaborative travel planner. Prior to 3.4.0, the checkSsrf logic in server/src/utils/ssrfGuard.ts does not recognize NAT64, 6to4, or Teredo IPv6 transition addresses that encode an IPv4 destination. An authenticated user who controls a DNS record can supply a URL whose AAAA result is a transition address embedding a private, loopback, or link-local IPv4 target, and isAlwaysBlocked and isPrivateNetwork classify the address as allowed. In a deployment that routes the applicable transition format, user-facing imports, webhooks, integrations, or plugin egress can reach internal services or cloud metadata and expose returned information. This issue is fixed in version 3.4.0.",
  "id": "CVE-2026-85738",
  "modified": "2026-09-30T03:30:28.475091436Z",
  "published": "2026-09-24T18:09:31.268Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/liketrek/TREK/releases/tag/v3.4.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85738.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85738"
    },
    {
      "type": "FIX",
      "url": "https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df"
    },
    {
      "type": "FIX",
      "url": "https://github.com/liketrek/TREK/pull/1540"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TREK: SSRF Guard Bypass via IPv6 Transition Addresses (NAT64/6to4)"
}