{"cve":"CVE-2026-25536","nvd":{"published":"2026-02-04T22:15:59.663","modified":"2026-07-15T02:18:54.340","status":"Modified","description":"MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections, most commonly in stateless StreamableHTTPServerTransport deployments. This issue has been patched in version 1.26.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","score":7.1},"cwes":["CWE-362","CWE-367"],"references":["https://github.com/modelcontextprotocol/typescript-sdk/issues/204","https://github.com/modelcontextprotocol/typescript-sdk/issues/243","https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7","https://access.redhat.com/errata/RHSA-2026:3960","https://access.redhat.com/security/cve/CVE-2026-25536"],"products":["lfprojects:mcp_typescript_sdk"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-25536","score":0.00293,"percentile":0.21962,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-345p-7cg4-v4c7","url":"https://osv.dev/vulnerability/GHSA-345p-7cg4-v4c7","summary":"@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse","modified":"2026-09-10T03:50:33.823318085Z","packages":[{"ecosystem":"npm","name":"@modelcontextprotocol/sdk","purl":"pkg:npm/%40modelcontextprotocol/sdk","ranges":[">=1.10.0 <1.26.0"],"fixed":["1.26.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}