EUVD-2026-58728Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Network-reachable with no privileges required; AC:H reflects shared-cache timing dependency; Integrity:High for full response substitution; Confidentiality:Low for potential cross-user cache leakage.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Cache key collision in CKAN MCP Server prior to version 0.4.112 allows an unauthenticated remote attacker to poison a shared in-process cache with a crafted response, causing legitimate victim queries to receive attacker-controlled data. The flaw lives in the canonicalizeParams function (src/utils/cache.ts), which joined query parameters with unescaped ampersand and equals-sign delimiters - the same delimiters used as structural separators - so a single parameter whose value embeds those characters produces an identical cache key to a distinct, legitimate multi-parameter query. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker and victim share the same running CKAN MCP Server process with a common in-process cache - for example, a multi-tenant or multi-agent deployment where multiple clients connect to one server instance. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N scores 6.5 (Medium), which is broadly consistent with independent assessment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with access to a shared CKAN MCP Server instance - for example, as one of several AI agent sessions routed through a common server - crafts a query whose parameter value embeds delimiter characters matching a known or guessable victim query pattern. The attacker sends this crafted query first, priming the cache with a collision key bound to attacker-controlled content. … |
| Remediation | Upgrade CKAN MCP Server to version 0.4.112 or later, which replaces the vulnerable k=v ampersand-join serialization in canonicalizeParams with canonical JSON serialization and wraps the full cache key in JSON array framing, eliminating the collision surface. … Detailed patch versions, workarounds, and compensating controls in full report. |
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