---
cve: "CVE-2026-85738"
severity: "MEDIUM"
cvss: 6.3
epss: ""
vendor: "liketrek"
kev: false
exploited: false
published: "2026-09-24 19:17:18"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-27T11:02:17+02:00"
---

# CVE-2026-85738

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- a2bd9be184a94997105ce190dad920c41e7b10df (Commit)
- 3ca1ef34bb371bb0c76ca1b392e56c8a1c98ceb8 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-85738) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_