{"answers":{"affected":"3 open source packages ship an affected version, including github.com/github/github-mcp-server. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47427 exists.","fix":"Upgrade github.com/github/github-mcp-server to 1.1.0 or later.","what":"CVE-2026-47427 is a high-severity vulnerability in github-mcp-server, published on 28 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-2026-47427 and fix it if it is affected.\n\nWhat it is: CVE-2026-47427 is a high-severity vulnerability in github-mcp-server, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47427 exists.\n\nAffected packages and fixed versions:\n- github.com/github/github-mcp-server (Go): affected all versions; fixed in 1.1.0\n- github.com/github/github-mcp-server (Go): affected all versions; fixed in 1.1.0\n- github.com/github/github-mcp-server (Go): affected all versions; fixed in 1.1.0\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-2026-47427/ (Markdown: https://insights.sbomify.com/CVE-2026-47427/index.md)","id":"CVE-2026-47427","markdown":"https://insights.sbomify.com/CVE-2026-47427/index.md","name":"CVE-2026-47427","record":{"aliases":["GHSA-w4q6-qw23-4rg7","GO-2026-6118"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"GitHub MCP Server","requires_auth":"none","summary":"Unauthenticated attackers can crash the GitHub MCP Server by sending a malformed completion request, causing a denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mcp_server","vendor":"github"}],"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-476","name":"NULL Pointer Dereference"}],"description":"GitHub MCP Server is GitHub's official MCP Server. Prior to 1.1.0, the CompletionsHandler function in pkg/github/server.go accesses params.Ref without first checking whether it is nil, so a completion/complete request with a missing or empty ref field triggers a nil pointer dereference and a Go runtime panic; because the crash occurs before any authentication or token validation, any unauthenticated client able to send JSON-RPC messages can crash the server, resulting in a complete denial of service. This issue is fixed in version 1.1.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler","id":"CVE-2026-47427","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"Vitest browser mode serves unsanitized otelCarrier query parameter as inline script","id":"CVE-2026-47428"},"packages":[{"ecosystem":"Go","fixed":["1.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/github/github-mcp-server","purl":null,"source":"GHSA-w4q6-qw23-4rg7"},{"ecosystem":"Go","fixed":["1.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/github/github-mcp-server","purl":"pkg:golang/github.com/github/github-mcp-server","source":"GHSA-w4q6-qw23-4rg7"},{"ecosystem":"Go","fixed":["1.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/github/github-mcp-server","purl":"pkg:golang/github.com/github/github-mcp-server","source":"GO-2026-6118"}],"prev":{"headline":"OpenAM OAuth Client Impersonation via JWKS Resolver Cache","id":"CVE-2026-47426"},"products":["github-mcp-server"],"published":"2026-07-28","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["github"]},"summary":"Unauthenticated attackers can crash the GitHub MCP Server by sending a malformed completion request, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2026-47427/"}