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TI-2026-39509 Aliases CVE-2026-54688GHSA-q87f-qc2r-2gw4

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

Priority MEDIUM 62CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00499 43rd percentileScored 2026-11-07
Fix Fixed mcp-searxng (ihor-sokoliuk): 1.2.0mcp-searxng (npm): 1.2.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ihor-sokoliukmcp-searxngbefore 1.2.01.2.0Patch availableCNA
—mcp-searxng (npm)before 1.2.11.2.1Patch availableGHSA-q87f-qc2r-2gw4
  • mcp-searxng Vendorihor-sokoliuk Affected before 1.2.0 Fixed in 1.2.0 Patch available CNA
  • mcp-searxng (npm) Vendor— Affected before 1.2.1 Fixed in 1.2.1 Patch available GHSA-q87f-qc2r-2gw4

Remediation

  • Fix · CNA mcp-searxng (ihor-sokoliuk) Fixed in 1.2.0
  • Fix · GHSA-q87f-qc2r-2gw4 mcp-searxng (npm) Fixed in 1.2.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54688
  2. 2026-10-03 Alias added: GHSA-q87f-qc2r-2gw4

References

Other 6

  • TI-2026-42087 mcp-searxng: Unbounded Response Body Read Bypasses URL Size Limit in `web_url_read` CVSS 3.1HIGH 7.5
  • TI-2026-42089 mcp-searxng: DNS-resolved Private Hostname SSRF in `web_url_read` CVSS 3.1HIGH 7.1
  • TI-2026-39510 mcp-searxng hardened-mode SSRF bypasses permit internal URL access CVSS 3.1MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences