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CVE-2026-55641

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

Published: Jul 10, 2026Updated: Jul 10, 2026 Sources: CVE List NVDCWE-290
8.2HIGH
NVD MITRE
EPSS Score
0.2%
Top 84.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

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

Affected Products

decolua
commercialaka 9router
9routerEmbedded
Networking Infrastructure / router-switch

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Command and Control
Initial Access
View detailed technique mapping

References

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

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