{"id":"CVE-2026-85738","summary":"TREK: SSRF Guard Bypass via IPv6 Transition Addresses (NAT64/6to4)","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.","aliases":["GHSA-9hpq-mrpx-mcxg"],"modified":"2026-09-29T03:30:30.353818203Z","published":"2026-09-24T18:09:31.268Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85738.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-918"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/liketrek/trek","events":[{"introduced":"0"},{"fixed":"a2bd9be184a94997105ce190dad920c41e7b10df"},{"fixed":"3ca1ef34bb371bb0c76ca1b392e56c8a1c98ceb8"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"3.4.0"}]}}],"versions":["v3.3.0","plugin-sdk-v1.4.0","plugin-sdk-v1.3.1","v3.2.1","plugin-sdk-v1.3.0","v3.2.0","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.22","v3.0.21","v3.0.20","v3.0.19","v3.0.18","v3.0.17","v3.0.16","v3.0.15","v3.0.14","v3.0.13","v3.0.12","v3.0.11","v3.0.10","v3.0.9","v3.0.8","v3.0.7","v3.0.6","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v2.9.14","v2.9.13","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.2","v2.8.4","v2.8.0","v2.7.2","v2.7.0","v2.6.2","v2.6.1","v2.6.0","v2.5.7","v2.5.6","v2.5.5","v2.5.4","v2.5.2","v2.5.1","v2.5.0","v2.4.0","v2.3.5","v2.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85738.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}