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CVE-2026-54689— mcp-searxng hardened-mode SSRF bypasses permit internal URL access

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 版本之前，当启用 且未启用 时， 中针对 的 URL 策略可以被绕过。其原因包括：重定向目标未再次验证、 未被归类为内部地址、以及规范化为十六进制形式的 IPv4 映射的 IPv6 字面量未被识别。这些输入使得受攻击者影响的工具调用能够促使 MCP 服务器获取回环或内部 HTTP 资源，并返回来自本地服务、私有 API、服务网格端点或云元数据端点的内容。由早期部分修复

CVSS 6.3 · 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-2026-54689

Vulnerability Information
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Vulnerability Title
mcp-searxng hardened-mode SSRF bypasses permit internal URL access
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, the web_url_read URL policy in src/url-reader.ts can be bypassed while MCP_HTTP_HARDEN is enabled and MCP_HTTP_ALLOW_PRIVATE_URLS is not enabled because redirect targets are not revalidated, 0.0.0.0 is not classified as an internal address, and IPv4-mapped IPv6 literals canonicalized to hexadecimal form are not recognized. These inputs allow an attacker-influenced tool call to make the MCP server fetch loopback or internal HTTP resources and return content from local services, private APIs, service-mesh endpoints, or cloud metadata endpoints. The separate hostname-to-private-address case addressed by the earlier partial fix is not part of these residual bypasses. This issue is fixed in version 1.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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-2026-54689

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III. Intelligence Information for CVE-2026-54689

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Patches & Fixes for CVE-2026-54689 (2)

Vendor Advisories for CVE-2026-54689 (1)

Vendor Pages for CVE-2026-54689 (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-2026-54688 6.5 MEDIUM mcp-searxng: SSRF in web_url_read: the internal-address guard is disabled by default (MCP_

IV. Related Vulnerabilities

Same product: mcp-searxng
Same vendor: ihor-sokoliuk
Same weakness: CWE-200

V. Comments for CVE-2026-54689

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