CVE-2026-55641

9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this exposes the /v1 proxy to upstream provider calls using stored provider credentials and allows /v1/search with the searxng provider_options.baseUrl parameter to drive server-side requests to internal or cloud-metadata hosts. This issue is fixed in version 0.5.2.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3
https://github.com/decolua/9router/releases/tag/v0.5.2
https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c
https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-10 17:16

Updated : 2026-07-10 20:16

NVD link : CVE-2026-55641

Mitre link : CVE-2026-55641

CVE.ORG link : CVE-2026-55641

JSON object : View

Products Affected

No product.

CWE

CWE-290

Authentication Bypass by Spoofing

CWE-348

Use of Less Trusted Source

CWE-918

Server-Side Request Forgery (SSRF)

CWE-1327

Binding to an Unrestricted IP Address

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