{"id":"CVE-2026-81100","summary":"Timescale tiger-gh-mcp-server DNS Rebinding via Disabled Host Header Allow-List","details":"tiger-gh-mcp-server started its MCP HTTP transport without enabling the host allow-list the underlying SDK provides. src/httpServer.ts called the shared httpServerFactory helper and never set the DNS-rebinding-protection option, so the transport accepted a request whatever host it named, making the locally reachable GitHub MCP endpoint drivable from a page in a visitor's browser that pointed a name it controlled at the bound address. The fix passes the option explicitly alongside a dependency update; the update alone would not have closed it. The repository has published no release that brackets the fix, so the affected boundary is the commit preceding it.","modified":"2026-10-08T02:52:04.967932648Z","published":"2026-08-27T14:50:39.728Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-346"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81100.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81100.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81100"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/timescale-tiger-gh-mcp-server-dns-rebinding-via-disabled-host-header-allow-list"},{"type":"FIX","url":"https://github.com/timescale/tiger-gh-mcp-server/pull/36"},{"type":"PACKAGE","url":"https://github.com/timescale/tiger-gh-mcp-server"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/timescale/tiger-gh-mcp-server","events":[{"introduced":"0"},{"fixed":"e559b57b57cf61277525ec96bbf1edcf01b16a21"}]}],"versions":["v0.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81100.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}