CVE-2026-81100
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
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 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| timescale | tiger-gh-mcp-server | e559b57b57cf61277525ec96bbf1edcf01b16a21 | unaffected |
| timescale | tiger-gh-mcp-server | 0 < e559b57b57cf61277525ec96bbf1edcf01b16a21 | affected |
Weaknesses
- CWE-346: Origin Validation Error
References
- https://github.com/timescale/tiger-gh-mcp-server
- https://github.com/timescale/tiger-gh-mcp-server/pull/36
- https://www.vulncheck.com/advisories/timescale-tiger-gh-mcp-server-dns-rebinding-via-disabled-host-header-allow-list
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