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Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity uncontrolled resource consumption in mcp-searxng from ihor-sokoliuk. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 47.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmmcp-searxng1.7.1GHSA-xcqx-9jf5-w339

Affected products (as reported)

VendorProductVersions
ihor-sokoliuk mcp-searxng < 1.7.1

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References