9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs

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Summary

CVECVE-2026-56675
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 17:17:01 UTC
Updated2026-07-10 17:35:11 UTC
Description9Router is an AI router & token saver. Prior to 0.5.2, 9router treats loopback requests as trusted and allows /v1/* access without an API key, so a same-host reverse proxy that forwards public traffic to the backend through 127.0.0.1 causes src/dashboardGuard.js to misclassify external requests as local. A remote unauthenticated attacker can access /v1 APIs such as /v1/models and may abuse configured upstream provider credentials through /v1 proxy endpoints depending on enabled providers. This issue is fixed in version 0.5.2.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

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

Problem Types: CWE-287 | CWE-290 | CWE-306 | CWE-441 | CWE-287 CWE-287: Improper Authentication | CWE-290 CWE-290: Authentication Bypass by Spoofing | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decolua 9router affected < 0.5.2 Not specified

References

ReferenceSourceLinkTags
github.com/decolua/9router/releases/tag/v0.5.2 [email protected] github.com
github.com/decolua/9router/security/advisories/GHSA-x5c9-v98j-722r [email protected] github.com
github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc [email protected] github.com
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