CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`) (CVE-2026-73845) | HOL Guard CVE

Medium · CVSS 5.3CVE-2026-73845GHSA-83X6-42HR-JC76

CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)

Answer in brief

CVE-2026-73845 records a Medium severity (CVSS 5.3) vulnerability in CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`). The current sources do not mark it as known exploited. The current feed maps ondata/ckan-mcp-server (generic), @aborruso/ckan-mcp-server (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 14, 2026Updated Sep 18, 2026Source checked Sep 29, 2026First seen by HOL Aug 14, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ondata/ckan-mcp-server (generic), @aborruso/ckan-mcp-server (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ondata/ckan-mcp-servergeneric	<0.4.112	0.4.112
@aborruso/ckan-mcp-servernpm	<0.4.112	0.4.112

Recommended response

Check inventory. Check lockfiles and deployed manifests for ondata/ckan-mcp-server, @aborruso/ckan-mcp-server.
Review the reported fix. Update ondata/ckan-mcp-server to 0.4.112; @aborruso/ckan-mcp-server to 0.4.112 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 14, 2026

Sources and claim methodology

Upstream source description

CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, the ckan_get_mqa_quality and ckan_get_mqa_quality_details tools in src/tools/quality.ts use isValidMqaServer to validate the server_url parameter with a prefix-only regular expression for dati.gov.it, allowing suffix-host and URL-userinfo values to target an attacker-controlled host and return a spoofed response. This issue is fixed in version 0.4.112.

Quoted source text, attributed separately from HOL analysis.