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CVE-2026-58483— mcp-searxng: Unbounded Response Body Read Bypasses URL Size Limit in `web_url_read`

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（Model Context Protocol）服务器，通过 SearXNG 为 AI 助手提供网络搜索和 URL 读取功能。在 1.7.1 版本之前， 中的 函数会将调用者提供的 URL 传递给 中的 函数。在该函数中， 将缺失的 响应头视为一种不明确的预检情况，随后正常路径和错误路径都会通过 消费完整的响应体。因此，如果服务器省略了 头，就可以绕过 限制，从而强制产生无界的内存使用。此外，生成的字符串还会被 处理，进一步增加 CPU 消耗，使得未认证的 HTTP 客户

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
ihor-sokoliuk mcp-searxng < 1.7.1 affected
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I. Basic Information for CVE-2026-58483

Vulnerability Information
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Vulnerability Title
mcp-searxng: Unbounded Response Body Read Bypasses URL Size Limit in `web_url_read`
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 1.7.1, web_url_read in src/index.ts passes a caller-supplied URL to readUrlContent() in src/url-reader.ts, where checkContentLength() treats a missing Content-Length header as an inconclusive preflight and the normal and error paths then consume the complete body with response.text(). A server that omits Content-Length can therefore bypass URL_READ_MAX_CONTENT_LENGTH_BYTES and force unbounded memory use. The resulting string is also processed by NodeHtmlMarkdown.translate(), increasing CPU consumption and allowing an unauthenticated HTTP client to cause denial of service. This issue is fixed in version 1.7.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ihor-sokoliuk mcp-searxng < 1.7.1 -

II. Public POCs for CVE-2026-58483

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III. Intelligence Information for CVE-2026-58483

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Patches & Fixes for CVE-2026-58483 (2)

Vendor Advisories for CVE-2026-58483 (1)

Vendor Pages for CVE-2026-58483 (1)

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

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_
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-400

V. Comments for CVE-2026-58483

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