Vulnerability · Published Aug 14, 2026 · Assigned by GitHub_M
CVE-2026-73846CKAN MCP Server: Cache-key canonicalization collision enables cache confusion / poisoning
Medium 6.5
In plain English
A medium-severity insufficient verification of data authenticity in ckan-mcp-server from ondata. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, canonicalizeParams in src/utils/cache.ts serializes request parameters with unescaped ampersand, equals-sign, and vertical-bar delimiters, allowing different logical parameter sets used by buildCacheKey to collide and an attacker to prime a shared cache with a response for a victim's distinct query. This issue is fixed in version 0.4.112.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @aborruso/ckan-mcp-server | 0.4.112 | GHSA-78x9-fhhx-v2g6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ondata | ckan-mcp-server | < 0.4.112 |
Weakness: CWE-345, CWE-436 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N