{"answers":{"affected":"2 open source packages ship an affected version, including @modelcontextprotocol/sdk. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-25536 in the wild and no public exploit code.","fix":"Upgrade @modelcontextprotocol/sdk to 1.26.0 or later.","what":"CVE-2026-25536 is a high-severity vulnerability in modelcontextprotocol typescript-sdk, published on 4 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-25536 and fix it if it is affected.\n\nWhat it is: CVE-2026-25536 is a high-severity vulnerability in modelcontextprotocol typescript-sdk, published on 4 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-25536 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @modelcontextprotocol/sdk (npm): affected from 1.10.0; fixed in 1.26.0\n- @modelcontextprotocol/sdk (npm): affected from 1.10.0; fixed in 1.26.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-25536/ (Markdown: https://insights.sbomify.com/CVE-2026-25536/index.md)","id":"CVE-2026-25536","markdown":"https://insights.sbomify.com/CVE-2026-25536/index.md","name":"CVE-2026-25536","record":{"aliases":["CLSA-2026-1788167244","CLSA-2026-1790611463","ECHO-75cb-c27c-38de","GHSA-345p-7cg4-v4c7","MINI-2ppw-q4cq-95fx","MINI-3444-738h-p3h9","MINI-8v5r-f66r-m8gh","MINI-f9qj-jvj6-m9x5","MINI-p2hc-wj6f-q334","MINI-r3h5-q4h6-62pf","MINI-vq82-8qj5-2gcf","MINI-xxh7-89ff-c6mw"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"MCP TypeScript SDK","requires_auth":"low_privilege","summary":"Attackers can read other clients' data when a single server instance is reused across multiple connections in stateless deployments.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mcp_typescript_sdk","vendor":"lfprojects"}],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-367","name":"Time-of-check Time-of-use (TOCTOU) Race Condition"},{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"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.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse","id":"CVE-2026-25536","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"jsonwebtoken has Type Confusion that leads to potential authorization bypass","id":"CVE-2026-25537"},"packages":[{"ecosystem":"npm","fixed":["1.26.0"],"introduced":["1.10.0"],"last_affected":[],"package":"@modelcontextprotocol/sdk","purl":null,"source":"GHSA-345p-7cg4-v4c7"},{"ecosystem":"npm","fixed":["1.26.0"],"introduced":["1.10.0"],"last_affected":[],"package":"@modelcontextprotocol/sdk","purl":"pkg:npm/%40modelcontextprotocol/sdk","source":"GHSA-345p-7cg4-v4c7"}],"prev":{"headline":"jsPDF Affected by Client-Side/Server-Side Denial of Service via Malicious GIF Dimensions","id":"CVE-2026-25535"},"products":["typescript-sdk"],"published":"2026-02-04","related":[{"cvss_score":8.7,"headline":"MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS","id":"CVE-2026-0621","kev_date_added":null,"published":"2026-01-05"},{"cvss_score":7.6,"headline":"DNS Rebinding Protection Disabled by Default in Model Context Protocol TypeScript SDK for Servers Running on Localhost","id":"CVE-2025-66414","kev_date_added":null,"published":"2025-12-02"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["modelcontextprotocol"]},"summary":"Attackers can read other clients' data when a single server instance is reused across multiple connections in stateless deployments.","url":"https://insights.sbomify.com/CVE-2026-25536/"}