ihor-sokoliuk mcp-searxng up to 1.7.0 URL Validation src/url-reader.ts assertUrlAllowed server-side request forgery

Summaryinfo

A vulnerability marked as problematic has been reported in ihor-sokoliuk mcp-searxng up to 1.7.0. This vulnerability affects the function assertUrlAllowed of the file src/url-reader.ts of the component URL Validation. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-58485. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in ihor-sokoliuk mcp-searxng up to 1.7.0 and classified as problematic. This issue affects the function assertUrlAllowed of the file src/url-reader.ts of the component URL Validation. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. 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. Impacted is confidentiality. The summary by CVE is:

mcp-searxng is a Model Context Protocol server that gives AI assistants web search and URL-reading capabilities through SearXNG. Prior to 1.7.1, web_url_read receives its caller-controlled URL through src/index.ts and validates only the literal hostname in assertUrlAllowed() within src/url-reader.ts before undiciFetch() performs operating-system DNS resolution. A public-looking attacker-controlled hostname that resolves to a private, loopback, link-local, or cloud-metadata address therefore passes the lexical check and causes the MCP server to connect to the internal destination. In the default HTTP configuration, an unauthenticated network client can use this path to read internal services, expose credentials or service tokens, and enumerate reachable internal hosts; in STDIO deployments, prompt-influenced tool selection can provide the malicious URL. Direct private IP literals are blocked, and MCP_HTTP_ALLOW_PRIVATE_URLS remains an explicit opt-out. This issue is fixed in version 1.7.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-58485 since 06/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 1.7.1 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• ihor-sokoliuk

Name

• mcp-searxng

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7.0

Website

• Product: https://github.com/ihor-sokoliuk/mcp-searxng/

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