{"answers":{"affected":"4 open source packages ship an affected version, including mcp.","exploited":"There is no known exploitation of CVE-2026-116684 in the wild and no public exploit code.","fix":"Upgrade mcp to a fixed version for your release line: 1.30.0 or 2.2.0.","what":"CVE-2026-116684 is a medium-severity vulnerability in modelcontextprotocol python-sdk, published on 27 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-116684 and fix it if it is affected.\n\nWhat it is: CVE-2026-116684 is a medium-severity vulnerability in modelcontextprotocol python-sdk, published on 27 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-116684 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mcp (PyPI): affected from 1.10.0; fixed in 1.30.0\n- mcp (PyPI): affected from 1.10.0; fixed in 1.30.0\n- mcp (PyPI): affected from 2.0.0; fixed in 2.2.0\n- mcp (PyPI): affected from 2.0.0; fixed in 2.2.0\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-2026-116684/ (Markdown: https://insights.sbomify.com/CVE-2026-116684/index.md)","id":"CVE-2026-116684","markdown":"https://insights.sbomify.com/CVE-2026-116684/index.md","name":"CVE-2026-116684","record":{"aliases":["GHSA-w4fh-qvv9-3v23"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":6.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.10.0 until 1.30.0 and 2.2.0, server-side bearer authentication configured through AuthSettings with token_verifier accepts a valid token issued for another service when the authorization server serves multiple resources and the TokenVerifier does not independently validate the aud audience. This resource-confusion flaw lets a token holder authenticate to the wrong MCP server and exercise that token's resulting access. This issue is fixed in versions 1.30.0 and 2.2.0.","ecosystems":["PyPI"],"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":"Model Context Protocol Python SDK: Server bearer-token authentication accepts tokens issued for a different resource server","id":"CVE-2026-116684","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":null,"year":"2026"},"n_packages":4,"n_references":7,"next":{"headline":"Model Context Protocol Python SDK: HTTP client transports followed cross-origin redirects carrying custom headers and bodies","id":"CVE-2026-116685"},"packages":[{"ecosystem":"PyPI","fixed":["1.30.0"],"introduced":["1.10.0"],"last_affected":[],"package":"mcp","purl":null,"source":"GHSA-w4fh-qvv9-3v23"},{"ecosystem":"PyPI","fixed":["1.30.0"],"introduced":["1.10.0"],"last_affected":[],"package":"mcp","purl":"pkg:pypi/mcp","source":"GHSA-w4fh-qvv9-3v23"},{"ecosystem":"PyPI","fixed":["2.2.0"],"introduced":["2.0.0"],"last_affected":[],"package":"mcp","purl":null,"source":"GHSA-w4fh-qvv9-3v23"},{"ecosystem":"PyPI","fixed":["2.2.0"],"introduced":["2.0.0"],"last_affected":[],"package":"mcp","purl":"pkg:pypi/mcp","source":"GHSA-w4fh-qvv9-3v23"}],"prev":{"headline":"CTFer.io's CTFd Terraform Provider allows a local or remote attacker to read team passwords in state as non sensitive values","id":"CVE-2026-116683"},"products":["python-sdk"],"published":"2026-10-27","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-27","vendors":["modelcontextprotocol"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-116684/"}