TREK: SSRF Guard Bypass via IPv6 Transition Addresses (NAT64/6to4)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85738
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 19:17:18 UTC
Updated2026-09-28 15:17:24 UTC
DescriptionTREK 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.

Risk And Classification

Primary CVSS: v3.1 6.3 MEDIUM from [email protected]

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

EPSS: 0.003030000 probability, percentile 0.206920000 (date 2026-09-29)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Liketrek TREK affected < 3.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df [email protected] github.com
github.com/liketrek/TREK/pull/1540 [email protected] github.com
github.com/liketrek/TREK/releases/tag/v3.4.0 [email protected] github.com
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