CVE-2026-85666 Details
Description
OGX (formerly Llama Stack, affected at commit fbe8e0f) contains an unauthenticated server-side request forgery vulnerability in the OpenAI-compatible POST /v1/responses endpoint. MCP tool definitions accept a server_url parameter (along with headers and authorization values) that is fetched server-side without destination validation; the existing validate_url_not_private() guard used for other URL inputs is not applied to server_url. On the default starter configuration, which runs without authentication, a remote unauthenticated attacker can cause the server to open connections to arbitrary internal addresses (including cloud metadata endpoints such as http://169.254.169.254/) and forward attacker-supplied headers and bearer tokens to those destinations.
A server-side request forgery (SSRF) vulnerability has been identified in OGX (formerly Llama Stack) version 1.3.1, specifically in the OpenAI-compatible POST /v1/responses endpoint. This vulnerability allows an unauthenticated remote attacker to manipulate the server into making requests to internal addresses, including cloud metadata endpoints, and to relay attacker-supplied headers and bearer tokens to those destinations. The issue arises because MCP tool definitions can include a server_url parameter that is processed without proper validation, leaving the server open to exploitation.
It is recommended to apply the validate_url_not_private() function to the server_url parameter in MCP tool definitions before processing them. This validation should be done to prevent requests to private or internal addresses.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 4, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ogx-ai/ogx | [email protected] | ProductSource CodeVendor |
| https://github.com/ogx-ai/ogx/blob/v1.3.1/src/ogx/providers/utils/tools/mcp.py | [email protected] | Source CodeVendor |
| https://github.com/ogx-ai/ogx/issues/6287 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/ogx-1.3.1-server-side-request-forgery-via-mcp-tool-server-url | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OGX | <= 1.3.1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 4, 2026 | New CVE Received | [email protected] |