{"action":"Upgrade @modelcontextprotocol/sdk to 1.25.2 or later.","affected":[{"fixed":"1.25.2","introduced":"1.3.0"}],"component":"@modelcontextprotocol/sdk","cve_ids":["CVE-2026-0621"],"ecosystem":"npm","epss":0.00438,"exploited":false,"fixed_versions":["1.25.2"],"ghsa_id":"GHSA-8r9q-7v3j-jr4g","id":"tcs_01M5KFDX9YGRG5VVY3SBXT3547","modified_at":"2026-09-10T03:50:59.009997048Z","published_at":"2026-01-05T21:30:33Z","references":["https://osv.dev/vulnerability/GHSA-8r9q-7v3j-jr4g","https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-cqwc-fm46-7fff","https://nvd.nist.gov/vuln/detail/CVE-2026-0621","https://github.com/modelcontextprotocol/typescript-sdk/issues/965","https://github.com/modelcontextprotocol/typescript-sdk/commit/7f0cf730","https://github.com/modelcontextprotocol/typescript-sdk/commit/b392f02ffcf37c088dbd114fedf25026ec3913d3","https://github.com/modelcontextprotocol/typescript-sdk","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/v1.25.2","https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redos"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-8r9q-7v3j-jr4g","url":"https://osv.dev/vulnerability/GHSA-8r9q-7v3j-jr4g"},{"source":"nvd","source_id":"CVE-2026-0621","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0621"}],"summary":"Anthropic's MCP TypeScript SDK has a ReDoS vulnerability"}