Vulnerability details

CVE-2026-55641

decolua 9Router

9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF

CVSS 3.1

8.2High

Official description

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 scores

Score	Version	Source	Vector
8.2High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N`

Affected products

Vendor	Product	Versions	Source
decolua	9Router	< 0.5.2	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-07-10
Last updated: 2026-07-10
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.32%

Probability of exploitation in 30 days

25.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (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