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CVE-2026-54689

mcp-searxng hardened-mode SSRF bypasses permit internal URL access

MEDIUM
6.3
CVSS Score
Published: September 15, 2026 at 05:45 PM UTC
Updated: September 30, 2026 at 05:51 PM UTC
1 product affected across 1 vendorMcp Searxng

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mcp Searxng· Ihor Sokoliuk
60%
v < 1.2.0
Affected range stops below 1.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/ihor-sokoliuk/mcp-searxng/security/advisories/GHSA-wppf-h75h-6pm6
x_refsource_MISC
Source: cverecord
https://github.com/ihor-sokoliuk/mcp-searxng/pull/79
x_refsource_MISC
Source: cverecord
https://github.com/ihor-sokoliuk/mcp-searxng/commit/48e5ecdcb4166a60b94c252dbe74b0a318110ac4
x_refsource_MISC
Source: cverecord
https://github.com/ihor-sokoliuk/mcp-searxng/releases/tag/v1.2.0

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMGitHub_M
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-200CWE-918

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