{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-81100 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-81100 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-81100 is a high-severity server-side request forgery vulnerability in timescale tiger-gh-mcp-server, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-81100 and fix it if it is affected.\n\nWhat it is: CVE-2026-81100 is a high-severity server-side request forgery vulnerability in timescale tiger-gh-mcp-server, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-81100 in the wild and no public exploit code.\n\nAffected product: timescale tiger-gh-mcp-server. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-81100/ (Markdown: https://insights.sbomify.com/CVE-2026-81100/index.md)","id":"CVE-2026-81100","markdown":"https://insights.sbomify.com/CVE-2026-81100/index.md","name":"CVE-2026-81100","record":{"aliases":["GHSA-wm9h-qwfm-wf3g"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"GitHub MCP server","requires_auth":"none","summary":"Attackers can bypass host validation to drive the local GitHub MCP endpoint from a browser, enabling unauthorized access to local resources.","user_interaction":"required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.6,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Timescale tiger-gh-mcp-server DNS Rebinding via Disabled Host Header Allow-List","id":"CVE-2026-81100","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Airtable MCP CLI before 0.2.5 Credential Disclosure via Unvalidated Configured Endpoint","id":"CVE-2026-81101"},"packages":[],"prev":{"headline":"Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List","id":"CVE-2026-81099"},"products":["tiger-gh-mcp-server"],"published":"2026-08-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-29","vendors":["timescale"]},"summary":"Attackers can bypass host validation to drive the local GitHub MCP endpoint from a browser, enabling unauthorized access to local resources.","url":"https://insights.sbomify.com/CVE-2026-81100/"}