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CVE-2026-85738

6.3 · MEDIUM

TREK is a collaborative travel planner.

Published Sep 24, 2026CWE-918EPSS 0.39%

Overview

CVE-2026-85738 is a medium-severity vulnerability. It was published on September 24, 2026 and has a CVSS 3.1 base score of 6.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10dfGitHubgithub.com/liketrek/TREK/pull/1540GitHubgithub.com/liketrek/TREK/releases/tag/v3.4.0GitHubgithub.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxgGitHubgithub.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-85738?

CVE-2026-85738 is a medium-severity vulnerability. It was published on September 24, 2026 and has a CVSS 3.1 base score of 6.3 (MEDIUM).

How severe is CVE-2026-85738?

This vulnerability has a CVSS 3.1 base score of 6.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-85738?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-85738?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-85738 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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