{"schema":"threatline.record/2","record":{"id":"CVE-2026-85738","aliases":["GHSA-9hpq-mrpx-mcxg"],"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.","categories":["Unclassified"],"product":"TREK","vendor":"liketrek","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-85738","source_modified_at":"2026-09-28T14:51:56.222Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"TREK","vendor":"liketrek","versions":[{"version":"< 3.4.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00303,"percentile":0.21875,"score_date":"2026-10-23"},"published_at":"2026-09-24T18:09:31.268Z","modified_at":"2026-09-28T14:51:56.222Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-85738","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T14:51:56.222Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-85738","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/liketrek/TREK/pull/1540","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/liketrek/TREK/releases/tag/v3.4.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-28T14:51:50.053724Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-28T14:51:56.222Z","content_hash":"41ad1e22fa54cbd05eec7d43fe73683f18606437415ef2d2c22e21605c8653ad"}}