{"id":"CVE-2026-85738","title":"TREK is a collaborative travel planner","summary":"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 c…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-918"],"vendor":"liketrek","product":"TREK","affected":["TREK < 3.4.0"],"published":"2026-09-24","updated":"2026-09-28","sourceUpdated":"2026-09-28T15:17:24.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85738","references":[{"url":"https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df","label":"security-advisories@github.com"},{"url":"https://github.com/liketrek/TREK/pull/1540","label":"security-advisories@github.com"},{"url":"https://github.com/liketrek/TREK/releases/tag/v3.4.0","label":"security-advisories@github.com"},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","label":"security-advisories@github.com"},{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00385,"epssPercentile":0.32341,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T14:51:50.053724Z"},"ingestedAt":"2026-09-24T18:49:36.724Z","slug":"CVE-2026-85738","body":"## Overview\n\nTREK 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":34.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":211978,"id":"CVE-2026-85738","ts":1790608489923,"field":"exploit_available","old":"false","new":"true"}]}