{"id":"CVE-2026-85738","revision":"d772dc2a76f04c0aa0141e521fa6ee3e","records":[{"revision":"d772dc2a76f04c0aa0141e521fa6ee3e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-85738","aliases":[],"title":"TREK: SSRF Guard Bypass via IPv6 Transition Addresses (NAT64/6to4)","description":"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.","state":0,"publishedAt":"2026-09-24T18:09:31.268+00:00","modifiedAt":"2026-09-28T14:51:56.222+00:00","affected":[{"ecosystem":"Vendor product","name":"TREK","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"liketrek\",\n                    \"product\": \"TREK\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.4.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","score":6.3,"severity":"MEDIUM"}],"references":["https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","https://github.com/liketrek/TREK/pull/1540","https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df","https://github.com/liketrek/TREK/releases/tag/v3.4.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-85738","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-85738","identifiers":["CVE-2026-85738"]},"retained":false,"historicalAffected":[]}],"coverage":[]}