{"answers":{"affected":"2 open source packages ship an affected version, including mcp.","exploited":"There is no known exploitation of CVE-2026-67432 in the wild and no public exploit code.","fix":"Upgrade mcp to 0.23.0 or later.","what":"CVE-2026-67432 is a high-severity denial of service vulnerability in modelcontextprotocol ruby-sdk, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-67432 and fix it if it is affected.\n\nWhat it is: CVE-2026-67432 is a high-severity denial of service vulnerability in modelcontextprotocol ruby-sdk, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-67432 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mcp (RubyGems): affected all versions; fixed in 0.23.0\n- mcp (RubyGems): affected all versions; fixed in 0.23.0\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-2026-67432/ (Markdown: https://insights.sbomify.com/CVE-2026-67432/index.md)","id":"CVE-2026-67432","markdown":"https://insights.sbomify.com/CVE-2026-67432/index.md","name":"CVE-2026-67432","record":{"aliases":["GHSA-h669-8m4g-r2hc"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby MCP SDK","requires_auth":"none","summary":"An unauthenticated remote attacker can exhaust process memory by sending large JSON-RPC requests to the MCP Ruby SDK, causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem reads and parses an entire JSON-RPC POST body without a size limit, allowing an unauthenticated remote attacker to exhaust process memory. This issue is fixed in version 0.23.0.","ecosystems":["RubyGems"],"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":"MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport","id":"CVE-2026-67432","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Linuxfabrik monitoring-plugins: Symlink following in logfile legacy database migration","id":"CVE-2026-67433"},"packages":[{"ecosystem":"RubyGems","fixed":["0.23.0"],"introduced":["0"],"last_affected":[],"package":"mcp","purl":null,"source":"GHSA-h669-8m4g-r2hc"},{"ecosystem":"RubyGems","fixed":["0.23.0"],"introduced":["0"],"last_affected":[],"package":"mcp","purl":"pkg:gem/mcp","source":"GHSA-h669-8m4g-r2hc"}],"prev":{"headline":"MCP Ruby SDK: Ruby SSE Session Poisoning","id":"CVE-2026-67431"},"products":["ruby-sdk"],"published":"2026-07-29","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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-29","vendors":["modelcontextprotocol"]},"summary":"An unauthenticated remote attacker can exhaust process memory by sending large JSON-RPC requests to the MCP Ruby SDK, causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-67432/"}