CVE-2026-85738TREK: SSRF Guard Bypass via IPv6 Transition Addresses (NAT64/6to4)
Updated under an hour ago ()
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It affects liketrek TREK. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- Weakness (CWE)
- CWE-918
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
liketrek TREK liketrek:trek (from the name) | before 3.4.0 | CNA record |
References
- https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxgx-refsource-confirm
- https://github.com/liketrek/TREK/pull/1540x-refsource-misc
- https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10dfx-refsource-misc
- https://github.com/liketrek/TREK/releases/tag/v3.4.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.