CVE-2026-73846 ondata CVE debrief

Who should care

Defenders responsible for CKAN MCP Server instances should assess exposure and apply the patch to prevent potential cache poisoning attacks. This vulnerability may impact systems using CKAN MCP Server for querying open data portals.

Why it matters

The CKAN MCP Server vulnerability allows cache poisoning via improper parameter serialization, impacting defenders who manage CKAN MCP Server instances. Defenders should verify their version, apply the patch, and monitor for unusual cache behavior.

• Cache poisoning may lead to incorrect query results or data tampering.
• Defenders should verify CKAN MCP Server version and apply patch to prevent potential attacks.
• Inventory checks are necessary to ensure version 0.4.112 or later is deployed.

Technical summary

The CKAN MCP Server vulnerability allows an attacker to prime a shared cache with a response for a victim's distinct query due to improper serialization of request parameters with unescaped ampersand, equals-sign, and vertical-bar delimiters. This issue is fixed in version 0.4.112. The vulnerability impacts defenders who manage CKAN MCP Server instances, potentially leading to cache poisoning attacks. Defenders should verify their CKAN MCP Server version and apply the patch to prevent potential attacks. The vulnerability is caused by the improper serialization of request parameters.

Defensive priority

Defenders should prioritize verifying their CKAN MCP Server version and applying the patch to prevent potential cache poisoning attacks.

Recommended defensive actions

• Verify CKAN MCP Server version and apply patch to prevent potential cache poisoning attacks.
• Review and update inventory of CKAN MCP Server instances to ensure version 0.4.112 or later is deployed.
• Monitor for unusual cache behavior or query patterns that may indicate attempted exploitation.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and the fixed version. However, additional information on potential exploitation or affected systems is limited. Defenders should verify CKAN MCP Server version and review inventory to ensure version 0.4.112 or later is deployed. The vulnerability allows cache poisoning via improper parameter serialization, impacting defenders who manage CKAN MCP Server instances.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.