high8.3
CVE-2026-56675
9router /v1 APIs has unauthenticated access via reverse proxy locality collapse
Impact
9Router 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | 9router | <= 0.4.80 | 0.5.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-x5c9-v98j-722r
- https://github.com/decolua/9router/security/advisories/GHSA-x5c9-v98j-722r
- https://nvd.nist.gov/vuln/detail/CVE-2026-56675
- https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc
- https://github.com/decolua/9router/releases/tag/v0.5.2