Is CVE-2026-85738 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-85738 being exploited in the wild.

How severe is CVE-2026-85738?

Medium severity, with a CVSS score of 6.3, published 24 September 2026.

Is there a fix for CVE-2026-85738?

A patch was published on 2026-07-18: Fixed in version 3.4.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-85738 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-85738?

Check whether you run Liketrek TREK at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-85738: TREK SSRF bypass via IPv6 transition addresses

CVE-2026-85738 · Severity: medium · CVSS 6.3 · Published 2026-09-24

TREK is a collaborative travel planning application. Prior to version 3.4.0, the server's SSRF protection logic fails to properly validate IPv6 transition addresses (NAT64, 6to4, Teredo) that encode private or internal IPv4 targets. An authenticated attacker controlling a DNS record can exploit this to make the server reach internal services or cloud metadata endpoints, potentially exposing sensitive information.

Technologies: Liketrek TREK. Vendors: Liketrek.

Quick answers

Is CVE-2026-85738 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-85738 being exploited in the wild.
How severe is CVE-2026-85738?: Medium severity, with a CVSS score of 6.3, published 24 September 2026.
Which products and versions are affected?: Liketrek TREK prior to 3.4.0.
Is there a fix for CVE-2026-85738?: A patch was published on 2026-07-18: Fixed in version 3.4.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-85738 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-85738?: Check whether you run Liketrek TREK at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The checkSsrf validation in server/src/utils/ssrfGuard.ts does not recognize IPv6 transition address formats that embed IPv4 destinations, allowing isAlwaysBlocked and isPrivateNetwork checks to incorrectly classify such addresses as allowed. An authenticated user can supply a crafted DNS AAAA record resolving to a transition address embedding a private, loopback, or link-local IPv4 target, which the server then accesses through user-facing imports, webhooks, integrations, or plugin egress. The vulnerability requires deployment using one of these transition formats and authentication to the application.

Affected products

liketrek TREK prior to 3.4.0

Timeline

2026-09-24: disclosed
2026-07-18: patched: Fixed in version 3.4.0

References

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