CVE-2026-58485 mcp-searxng: DNS-resolved Private Hostname SSRF in `web_url_read`
An attacker can exploit a DNS rebinding flaw in mcp-searxng to access internal network resources and sensitive data via the web_url_read function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58485?
CVE-2026-58485 is a high-severity server-side request forgery vulnerability in ihor-sokoliuk mcp-searxng, published on 15 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-58485?
2 open source packages ship an affected version, including mcp-searxng.
| Package | Affected | Fixed in |
|---|---|---|
mcp-searxng npm | All versions | 1.7.1 |
mcp-searxng npm | All versions | 1.7.1 |
How do I fix CVE-2026-58485?
Upgrade mcp-searxng to 1.7.1 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-58485 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58485 exists.
Sources
Also known as GHSA-mrvx-jmjw-vggc.