{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-81092 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-81092 is a high-severity server-side request forgery vulnerability in mark3labs mcp-go, 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-2026-81092 and fix it if it is affected.\n\nWhat it is: CVE-2026-81092 is a high-severity server-side request forgery vulnerability in mark3labs mcp-go, 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-2026-81092 in the wild and no public exploit code.\n\nAffected product: mark3labs mcp-go. 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-2026-81092/ (Markdown: https://insights.sbomify.com/CVE-2026-81092/index.md)","id":"CVE-2026-81092","markdown":"https://insights.sbomify.com/CVE-2026-81092/index.md","name":"CVE-2026-81092","record":{"aliases":["GHSA-8g5x-gj7x-mxgm","RHSA-2026:54874"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Go MCP library","requires_auth":"none","summary":"A browser-based attacker can exploit missing Host header validation in mcp-go to perform DNS rebinding attacks, accessing local MCP servers to read resources or invoke tools.","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":"mcp-go accepted requests on its HTTP transports without checking the Host header. StreamableHTTPServer.ServeHTTP in server/streamable_http.go and SSEServer.ServeHTTP in server/sse.go served any request arriving over a loopback connection regardless of the host it named, and the SSE transport's cross-origin default allowed any origin. A page in a browser could therefore point a name it controlled at the loopback address and reach a server listening there, invoking tools and reading resources that the server exposed on the assumption that only local software could connect. No release before 0.56.0 validated the header on either transport; 0.56.0 adds server/http_localhost.go, which rejects a loopback-bound request carrying a host that is not a loopback name, and wires it into both transports.","ecosystems":["Red Hat:hummingbird:1"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"mcp-go before 0.56.0 Missing Host Header Validation Enables DNS Rebinding","id":"CVE-2026-81092","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":1,"n_references":4,"next":{"headline":"Apify Actors MCP Server before 0.9.12 Server-Side Request Forgery via get-html-skeleton","id":"CVE-2026-81093"},"packages":[{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:3.0.3-0.1.hum1"],"introduced":["0"],"last_affected":[],"package":"tempo3.0","purl":"pkg:rpm/redhat/tempo3.0","source":"RHSA-2026:54874"}],"prev":{"headline":"mcp-use Inspector Proxy Server-Side Request Forgery via Caller-Supplied Target URL","id":"CVE-2026-81091"},"products":["mcp-go"],"published":"2026-08-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"partial"},"state":"PUBLISHED","updated":"2026-08-29","vendors":["mark3labs"]},"summary":"A browser-based attacker can exploit missing Host header validation in mcp-go to perform DNS rebinding attacks, accessing local MCP servers to read resources or invoke tools.","url":"https://insights.sbomify.com/CVE-2026-81092/"}