> CVE-2026-55641 [HIGH]

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PUBLISHED
2026-07-10 17:16
MODIFIED
2026-07-10 17:35
CVSS_SCORE V3
8.2
EPSS (Prob. Exploit)
0.33%
Top 74.3%
DATA SOURCES:
NVD đź”— 2026-07-10 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EXPLOITABILITY
3.9
IMPACT
4.2

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-290 CWE-348 CWE-918 CWE-1327

> CWE DETAILED DESCRIPTIONS

CWE-290: Authentication Bypass by Spoofing - This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. | CWE-348: Use of Less Trusted Source - The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. | CWE-918: Server-Side Request Forgery - The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. | CWE-1327: Binding to an Unrestricted IP Address - The product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely.

> GITHUB SECURITY ADVISORY

GHSA-86m2-fcxq-5q7c HIGH

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

AFFECTED PACKAGES:
NPM / 9router
< 0.5.2
Fixed in: 0.5.2

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

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

AFFECTED PACKAGES:
Unknown / Unknown
65 versions affected
ALIASES:
GHSA-86m2-fcxq-5q7c

> HISTORIQUE DES MODIFICATIONS

Première apparition
10/07/2026 17:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-290: Authentication Bypass by Spoofing - This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. | CWE-348: Use of Less Trust...
Nouvelle valeur:
CWE-290: Authentication Bypass by Spoofing - This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. | CWE-348: Use of Less Trust...
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-290: Authentication Bypass by Spoofing - This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. | CWE-348: Use of Less Trust...
Total des modifications: 2 Dernière mise à jour: 5 days ago

> REFERENCES

https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0...
https://github.com/decolua/9router/releases/tag/v0.5.2
https://github.com/decolua/9router/security/advisories/GHSA-86m2-fcxq-5q7c
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