{"id":"CVE-2026-81100","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-81100","summary":"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…","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.","published":"2026-08-27T17:20:52.620","modified":"2026-08-27T17:20:52.620","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/timescale/tiger-gh-mcp-server/pull/36","label":"timescale/tiger-gh-mcp-server#36"},"references":[{"type":"WEB","url":"https://github.com/timescale/tiger-gh-mcp-server"},{"type":"WEB","url":"https://github.com/timescale/tiger-gh-mcp-server/pull/36"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/timescale-tiger-gh-mcp-server-dns-rebinding-via-disabled-host-header-allow-list"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T17:20:52.620"}}