{"id":"EUVD-2026-0800","revision":"22ae88aca1444e6e991da13ea628b69c","records":[{"revision":"22ae88aca1444e6e991da13ea628b69c","observedAt":"2026-10-27T23:59:47.734+00:00","statement":{"source":"euvd","id":"EUVD-2026-0800","aliases":["CVE-2026-0621","GHSA-8r9q-7v3j-jr4g"],"title":"Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated reg…","description":"Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated regular expression used during URI matching contains nested quantifiers that can trigger catastrophic backtracking on specially crafted inputs, resulting in excessive CPU consumption. An attacker can exploit this by supplying a malicious URI that causes the Node.js process to become unresponsive, leading to a denial of service.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":null}],"references":["https://github.com/modelcontextprotocol/typescript-sdk/issues/965","https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redos"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-0800","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jan 5, 2026, 8:57:14 PM","dateUpdated":"Oct 8, 2026, 3:21:41 PM"},"relatedAdvisories":[{"id":"WID-SEC-W-2026-0328","title":"IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2025-13491","CVE-2025-61727","CVE-2025-61729","CVE-2026-0621","CVE-2026-21226","CVE-2026-22817","CVE-2026-22818"]}],"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-2026-0800","identifiers":["EUVD-2026-0800","CVE-2026-0621","GHSA-8r9q-7v3j-jr4g"]},"retained":false,"historicalAffected":[]}],"coverage":[]}