{"id":"CVE-2026-85738","published":"2026-09-24T19:17:18.193","lastModified":"2026-09-28T15:17:24.297","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.","cvssScore":6.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","cwes":["CWE-918"],"vendors":[],"products":[],"references":[{"url":"https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df","tags":[]},{"url":"https://github.com/liketrek/TREK/pull/1540","tags":[]},{"url":"https://github.com/liketrek/TREK/releases/tag/v3.4.0","tags":[]},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","tags":[]},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","tags":[]}],"exploitRefs":[{"url":"https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df","tags":[]},{"url":"https://github.com/liketrek/TREK/pull/1540","tags":[]},{"url":"https://github.com/liketrek/TREK/releases/tag/v3.4.0","tags":[]},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","tags":[]},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","tags":[]}],"hasPoc":true,"ai":null}