{"answers":{"affected":"6 open source packages ship an affected version, including @frontmcp/adapters, @frontmcp/sdk and mcp-from-openapi. It affects 4 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39885 exists.","fix":"Upgrade @frontmcp/adapters to 1.0.4 or later.","what":"CVE-2026-39885 is a high-severity server-side request forgery vulnerability in @frontmcp adapters, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-39885 and fix it if it is affected.\n\nWhat it is: CVE-2026-39885 is a high-severity server-side request forgery vulnerability in @frontmcp adapters, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39885 exists.\n\nAffected packages and fixed versions:\n- @frontmcp/adapters (npm): affected all versions; fixed in 1.0.4\n- @frontmcp/adapters (npm): affected all versions; fixed in 1.0.4\n- @frontmcp/sdk (npm): affected all versions; fixed in 1.0.4\n- @frontmcp/sdk (npm): affected all versions; fixed in 1.0.4\n- mcp-from-openapi (npm): affected all versions; fixed in 2.3.0\n- mcp-from-openapi (npm): affected all versions; fixed in 2.3.0\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-2026-39885/ (Markdown: https://insights.sbomify.com/CVE-2026-39885/index.md)","id":"CVE-2026-39885","markdown":"https://insights.sbomify.com/CVE-2026-39885/index.md","name":"CVE-2026-39885","record":{"aliases":["GHSA-v6ph-xcq9-qxxj"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"MCP TypeScript framework","requires_auth":"none","summary":"Attackers can trigger SSRF and local file reads by providing malicious OpenAPI specifications to the FrontMCP library.","user_interaction":"not_required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"\\@frontmcp\\/adapters","vendor":"agentfront"},{"product":"\\@frontmcp\\/sdk","vendor":"agentfront"},{"product":"frontmcp","vendor":"agentfront"},{"product":"mcp-from-openapi","vendor":"frontmcp"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"}],"description":"FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications","id":"CVE-2026-39885","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":6,"n_references":2,"next":{"headline":"OpenEXR has HTJ2K Signed Integer Overflow in ht_undo_impl()","id":"CVE-2026-39886"},"packages":[{"ecosystem":"npm","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"@frontmcp/adapters","purl":null,"source":"GHSA-v6ph-xcq9-qxxj"},{"ecosystem":"npm","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"@frontmcp/adapters","purl":"pkg:npm/%40frontmcp/adapters","source":"GHSA-v6ph-xcq9-qxxj"},{"ecosystem":"npm","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"@frontmcp/sdk","purl":null,"source":"GHSA-v6ph-xcq9-qxxj"},{"ecosystem":"npm","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"@frontmcp/sdk","purl":"pkg:npm/%40frontmcp/sdk","source":"GHSA-v6ph-xcq9-qxxj"},{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["0"],"last_affected":[],"package":"mcp-from-openapi","purl":null,"source":"GHSA-v6ph-xcq9-qxxj"},{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["0"],"last_affected":[],"package":"mcp-from-openapi","purl":"pkg:npm/mcp-from-openapi","source":"GHSA-v6ph-xcq9-qxxj"}],"prev":{"headline":"MCP Server Kubernetes has Argument Injection in its port_forward tool via space-splitting","id":"CVE-2026-39884"},"products":["adapters","frontmcp","mcp-from-openapi","sdk"],"published":"2026-04-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-09","vendors":["@frontmcp","agentfront","frontmcp"]},"summary":"Attackers can trigger SSRF and local file reads by providing malicious OpenAPI specifications to the FrontMCP library.","url":"https://insights.sbomify.com/CVE-2026-39885/"}