CVE-2026-54689 (GCVE-0-2026-54689)
Vulnerability from cvelistv5 – Published: 2026-09-15 17:45 – Updated: 2026-09-17 16:39
VLAI
EPSS
VEX
Title
mcp-searxng hardened-mode SSRF bypasses permit internal URL access
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, 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.
Severity
6.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 16:39 UTC
CWE
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ihor-sokoliuk/mcp-searxng/secu… | x_refsource_CONFIRM |
| https://github.com/ihor-sokoliuk/mcp-searxng/pull/79 | x_refsource_MISC |
| https://github.com/ihor-sokoliuk/mcp-searxng/comm… | x_refsource_MISC |
| https://github.com/ihor-sokoliuk/mcp-searxng/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ihor-sokoliuk | mcp-searxng |
Affected:
< 1.2.0
|
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