CVE-2026-81100
- Source
- https://cve.org/CVERecord?id=CVE-2026-81100
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81100.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-81100
- Published
- 2026-08-27T14:50:39Z
- Modified
- 2026-10-08T02:52:04Z
- Severity
-
- 7.6 (High) CVSS_V4 - 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 CVSS Calculator
- 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.
- 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
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81100.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-81100
- https://www.vulncheck.com/advisories/timescale-tiger-gh-mcp-server-dns-rebinding-via-disabled-host-header-allow-list
- https://github.com/timescale/tiger-gh-mcp-server/pull/36
- https://github.com/timescale/tiger-gh-mcp-server