{"id":"EUVD-2026-58728","revision":null,"records":[{"revision":"40423eccdb4d422e845cf08eaf92fe69","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73846","aliases":[],"title":"CKAN MCP Server: Cache-key canonicalization collision enables cache confusion / poisoning","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.","state":0,"publishedAt":"2026-08-14T16:56:23.752+00:00","modifiedAt":"2026-08-17T19:32:41.058+00:00","affected":[{"ecosystem":"Vendor product","name":"ckan-mcp-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ondata\",\n                    \"product\": \"ckan-mcp-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.4.112\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-78x9-fhhx-v2g6","https://github.com/ondata/ckan-mcp-server/commit/8e1522f9bbfa1f3b21550f17887f60f133e24151","https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73846","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73846","identifiers":["CVE-2026-73846"]},"retained":false,"historicalAffected":[]},{"revision":"27bf07dfee89437f9a0b09a86917b3ed","observedAt":"2026-11-11T16:06:17.349+00:00","statement":{"source":"euvd","id":"EUVD-2026-58728","aliases":["CVE-2026-73846","GHSA-78x9-fhhx-v2g6"],"title":"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 l…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5,"severity":null}],"references":["https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-78x9-fhhx-v2g6","https://github.com/ondata/ckan-mcp-server/commit/8e1522f9bbfa1f3b21550f17887f60f133e24151","https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-58728","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 14, 2026, 4:56:23 PM","dateUpdated":"Aug 17, 2026, 7:32:41 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-58728","identifiers":["EUVD-2026-58728","CVE-2026-73846","GHSA-78x9-fhhx-v2g6"]},"retained":false,"historicalAffected":[]},{"revision":"324422dca3b443f985bf0d2d19ce30a3","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73846","aliases":[],"title":"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 l…","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.","state":0,"publishedAt":"2026-08-14T17:20:36.953+00:00","modifiedAt":"2026-09-18T20:09:01.757+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/ondata/ckan-mcp-server/commit/8e1522f9bbfa1f3b21550f17887f60f133e24151","https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112","https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-78x9-fhhx-v2g6"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73846","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-345","CWE-436"],"productCriteria":[],"sourceDates":{"published":"2026-08-14T17:20:36.953","lastModified":"2026-09-18T20:09:01.757"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73846","identifiers":["CVE-2026-73846"]},"retained":false,"historicalAffected":[]},{"revision":"5317519a37f64534a1917a998bc5cb3b","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-78x9-fhhx-v2g6","aliases":["CVE-2026-73846"],"title":"CKAN MCP Server: Cache-key canonicalization collision enables cache confusion / poisoning","description":"## Summary\n\nThe response cache derives its key from an ambiguous string serialization of the request parameters. `canonicalizeParams` joins sorted `${key}=${value}` pairs with `&` and does not escape `&`, `=`, or the `|` field separators used in `buildCacheKey`. Two **different** logical parameter sets can therefore serialize to the **same** key and share one cache entry. Because the cached value is whatever the upstream returned for whichever request populated the entry first, an attacker can prime a colliding key so a victim's distinct query (same `server_url`) is served the attacker's cached response.\n\n## Affected code\n\n```js\n// src/utils/cache.ts\nexport function canonicalizeParams(params) {\n  const keys = Object.keys(params).sort();\n  const pairs = [];\n  for (const key of keys) {\n    const value = params[key];\n    if (value === undefined || value === null) continue;\n    const serialized = typeof value === \"object\" ? JSON.stringify(value) : String(value);\n    pairs.push(`${key}=${serialized}`);        // value not escaped\n  }\n  return pairs.join(\"&\");                        // '&' delimiter, injectable\n}\n\nexport async function buildCacheKey(serverUrl, action, params) {\n  const raw = `${serverUrl}|${action}|${canonicalizeParams(params)}`;  // '|' also unescaped\n  return sha1Hex(raw);\n}\n```\n\nConfirmed collisions (identical key):\n\n- `{ q: \"budget\", rows: 10 }`  ≡  `{ q: \"budget&rows=10\" }`  → both canonicalize to `q=budget&rows=10`\n- `{ filters: { a: \"b\" } }`  ≡  `{ filters: '{\"a\":\"b\"}' }`  → both canonicalize to `filters={\"a\":\"b\"}` (object-vs-string ambiguity)\n\nAn attacker can reproduce **any** target canonical string by injecting it into the alphabetically-first parameter, so the collision is general, not incidental.\n\n## Impact\n\n- **Cache poisoning / confusion.** On a shared cache (caching is enabled by\n  default; the Cloudflare Workers deployment uses the shared `caches.default`, and\n  a Node HTTP instance shares one in-process LRU across all clients), an attacker\n  primes a colliding entry so that another client's genuinely different query\n  receives the attacker-chosen response for the same portal.\n- **Integrity of results.** Victims receive data for a query they did not make\n  (wrong dataset list, wrong record set), undermining trust in tool output.\n- **Chains with indirect prompt injection (advisory #07).** The attacker's\n  colliding request can be one whose upstream response surfaces an\n  attacker-controlled dataset (with malicious `notes`/`title`); the victim's\n  benign query then serves that poisoned content to the model — delivering prompt\n  injection via the cache, without the victim ever querying the malicious dataset.\n\nConfidentiality impact is low (same-portal public data); the primary damage is\nintegrity. `AC:H` reflects the need for caching to be enabled and a shared\ninstance plus priming before the victim's request populates the entry.\n\n## Proof of concept\n\n`poc/cache-collision-poc.mjs` primes a single-param request and shows a victim's\ndistinct two-param request being served the attacker-primed entry:\n\n```\nattacker canonical : q=budget&rows=10\nvictim   canonical : q=budget&rows=10\nsame cache key      : true\nvictim served from cache: true\nvictim RECEIVED    : RESULT_FOR({\"q\":\"budget&rows=10\"})\nvictim EXPECTED    : RESULT_FOR({\"q\":\"budget\",\"rows\":10})\n```\n\n## Remediation\n\n- Build the cache key from an unambiguous, injection-proof encoding: hash a\n  structured, canonical JSON (with typed values) or percent-encode/escape each key\n  and value before joining, and use a separator that cannot appear in the encoded\n  fields. Include a type tag so `{a:{...}}` (object) and `{a:\"...\"}` (string)\n  never coincide.\n- Consider partitioning the cache per client/tenant on shared deployments so one\n  client cannot influence another's entries.","state":0,"publishedAt":"2026-09-03T14:49:22+00:00","modifiedAt":"2026-09-03T15:00:09.6205542+00:00","affected":[{"ecosystem":"npm","name":"@aborruso/ckan-mcp-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.4.112"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-78x9-fhhx-v2g6","https://nvd.nist.gov/vuln/detail/CVE-2026-73846","https://github.com/ondata/ckan-mcp-server/commit/8e1522f9bbfa1f3b21550f17887f60f133e24151","https://github.com/ondata/ckan-mcp-server","https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112"],"sourceUrl":"https://github.com/advisories/GHSA-78x9-fhhx-v2g6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-78x9-fhhx-v2g6","identifiers":["GHSA-78x9-fhhx-v2g6","CVE-2026-73846"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-13T03:19:40.5269590+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-13T03:19:40.526959+00:00","lastSuccessAt":"2026-11-13T03:19:40.6882289+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:40.688234+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-d8fa82e95fdb59244e2f635e667ba17f0796ca0a4f1f4bb8cc31febcd660b76c-98121ba726768336a864ab5bced2f3860f36459d7555a27229b152c25d7e1f39","complete":true,"records":424942,"lastAttemptAt":"2026-11-13T03:16:36.8593016+00:00","lastSuccessAt":"2026-11-13T03:16:36.8357038+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:16:36.8593016+00:00","snapshotPublishedAt":"2026-11-13T02:30:23+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-7f404f09616a40578b159775b5b66635","complete":false,"records":13793,"lastAttemptAt":"2026-11-13T03:29:27.9813623+00:00","lastSuccessAt":"2026-11-13T03:29:27.977+00:00","error":"370 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-13T03:29:27.977+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13369,"expectedIdentifiers":13846,"failedIdentifiers":370},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-13T03:19:40.5269590+00:00","complete":true,"records":1123,"lastAttemptAt":"2026-11-13T03:19:40.526959+00:00","lastSuccessAt":"2026-11-13T03:19:40.6892892+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:40.6892894+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-99b329e58ea7441eaabf9a9af1bb4458","complete":true,"records":13781,"lastAttemptAt":"2026-11-13T03:19:48.7349646+00:00","lastSuccessAt":"2026-11-13T03:19:48.73+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:48.73+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13846,"expectedIdentifiers":13846,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-93e76d404e1aeb6a7e8902f5ffa06211fc86dea3b1958e297abb2668aa5e6e8c","complete":true,"records":9952,"lastAttemptAt":"2026-11-13T03:19:40.4671686+00:00","lastSuccessAt":"2026-11-12T23:19:15.5239119+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:40.4671686+00:00","snapshotPublishedAt":"2026-11-12T23:03:02+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-4d60731753a2f72e455d1086e7203d0ef10843936dcc1cf2b45135e2caa204b0","complete":true,"records":2012,"lastAttemptAt":"2026-11-13T03:16:36.9337406+00:00","lastSuccessAt":"2026-11-12T18:16:50.7862525+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:16:36.9337406+00:00","snapshotPublishedAt":"2026-11-12T17:48:11+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-20d1a8ab073a1c13ab2143dbcadb34ebb8edf1e18e16482b448513662c3d1e12","complete":true,"records":3127,"lastAttemptAt":"2026-11-13T03:19:40.4889465+00:00","lastSuccessAt":"2026-11-12T22:18:31.0338213+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:40.4889465+00:00","snapshotPublishedAt":"2026-11-12T22:18:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-11714c374501e9f6ac09cc4e36bc0b50c7521131f606050aeabd7887ba2c0080","complete":true,"records":231743,"lastAttemptAt":"2026-11-13T03:19:40.3437235+00:00","lastSuccessAt":"2026-11-13T03:19:38.55958+00:00","error":null,"lastVerifiedAt":"2026-11-13T03:19:40.3437235+00:00","snapshotPublishedAt":"2026-11-13T02:48:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}