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CVE-2026-54688— mcp-searxng: SSRF in web_url_read: the internal-address guard is disabled by default (MCP_HTTP_HARDEN off)

Quick assessment

Affected
ihor-sokoliuk mcp-searxng
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mcp-searxng 是一个模型上下文协议（MCP）服务器，它通过 SearXNG 为 AI 助手提供网络搜索和 URL 读取功能。在 1.2.0 之前， 功能会将调用方提供的 URL 直接传入服务端的 fetch 路径，而 中的 检查仅在启用 时才会执行，但 中 默认是禁用的。在默认配置下，如果攻击者能够影响用户或 AI 代理所选的 URL，就可以让服务器获取环回地址（loopback）、私有网络或云元数据端点（cloud metadata endpoint）的资源，并将其内容返回到模型上下文中。 URL 仍然

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
ihor-sokoliuk mcp-searxng < 1.2.0 affected
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I. Basic Information for CVE-2026-54688

Vulnerability Information
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Vulnerability Title
mcp-searxng: SSRF in web_url_read: the internal-address guard is disabled by default (MCP_HTTP_HARDEN off)
Source: CVE Program / CVE List V5
Vulnerability Description
mcp-searxng is a Model Context Protocol server that gives AI assistants web search and URL-reading capabilities through SearXNG. Prior to 1.2.0, web_url_read passes a caller-supplied URL to the server-side fetch path while assertUrlAllowed() in src/url-reader.ts runs only when MCP_HTTP_HARDEN is enabled, even though MCP_HTTP_HARDEN is disabled by default in src/http-security.ts. In the default configuration, an attacker who influences the URL selected by a user or AI agent can make the server fetch loopback, private-network, or cloud metadata endpoint resources and return their contents into the model context. file:// URLs remain rejected, and the separate DNS-resolution and redirect-validation bypasses are outside this record. This issue is fixed in version 1.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ihor-sokoliuk mcp-searxng < 1.2.0 -

II. Public POCs for CVE-2026-54688

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III. Intelligence Information for CVE-2026-54688

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Patches & Fixes for CVE-2026-54688 (1)

Vendor Advisories for CVE-2026-54688 (1)

Vendor Pages for CVE-2026-54688 (1)

Other References for CVE-2026-54688 (1)

Same Patch Batch · ihor-sokoliuk · 2026-09-15 · 4 CVEs total

CVE-2026-58483 7.5 HIGH mcp-searxng: Unbounded Response Body Read Bypasses URL Size Limit in `web_url_read`
CVE-2026-58485 7.1 HIGH mcp-searxng: DNS-resolved Private Hostname SSRF in `web_url_read`
CVE-2026-54689 6.3 MEDIUM mcp-searxng hardened-mode SSRF bypasses permit internal URL access

IV. Related Vulnerabilities

Same product: mcp-searxng
Same vendor: ihor-sokoliuk
Same weakness: CWE-918

V. Comments for CVE-2026-54688

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