{"answers":{"affected":"2 open source packages ship an affected version, including mcp-server-kubernetes. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39884 exists.","fix":"Upgrade mcp-server-kubernetes to 3.5.0 or later.","what":"CVE-2026-39884 is a high-severity command injection vulnerability in Flux159 mcp-server-kubernetes, published on 14 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-39884 and fix it if it is affected.\n\nWhat it is: CVE-2026-39884 is a high-severity command injection vulnerability in Flux159 mcp-server-kubernetes, published on 14 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39884 exists.\n\nAffected packages and fixed versions:\n- mcp-server-kubernetes (npm): affected all versions; fixed in 3.5.0\n- mcp-server-kubernetes (npm): affected all versions; fixed in 3.5.0\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-2026-39884/ (Markdown: https://insights.sbomify.com/CVE-2026-39884/index.md)","id":"CVE-2026-39884","markdown":"https://insights.sbomify.com/CVE-2026-39884/index.md","name":"CVE-2026-39884","record":{"aliases":["GHSA-4xqg-gf5c-ghwq"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Kubernetes MCP server","requires_auth":"low_privilege","summary":"Attackers can inject arbitrary kubectl flags via space-splitting in the port_forward tool, enabling network exposure or cross-namespace access.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mcp-server-kubernetes","vendor":"suyogs"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-88","name":"Improper Neutralization of Argument Delimiters in a Command"}],"description":"mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Versions 3.4.0 and prior contain an argument injection vulnerability in the port_forward tool in src/tools/port_forward.ts, where a kubectl command is constructed via string concatenation with user-controlled input and then naively split on spaces before being passed to spawn(). Unlike all other tools in the codebase which correctly use array-based argument passing with execFileSync(), port_forward treats every space in user-controlled fields (namespace, resourceType, resourceName, localPort, targetPort) as an argument boundary, allowing an attacker to inject arbitrary kubectl flags. This enables exposure of internal Kubernetes services to the network by injecting --address=0.0.0.0, cross-namespace targeting by injecting additional -n flags, and indirect exploitation via prompt injection against AI agents connected to the MCP server. This issue has been fixed in version 3.5.0.","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":"MCP Server Kubernetes has Argument Injection in its port_forward tool via space-splitting","id":"CVE-2026-39884","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"command_injection","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications","id":"CVE-2026-39885"},"packages":[{"ecosystem":"npm","fixed":["3.5.0"],"introduced":["0"],"last_affected":[],"package":"mcp-server-kubernetes","purl":null,"source":"GHSA-4xqg-gf5c-ghwq"},{"ecosystem":"npm","fixed":["3.5.0"],"introduced":["0"],"last_affected":[],"package":"mcp-server-kubernetes","purl":"pkg:npm/mcp-server-kubernetes","source":"GHSA-4xqg-gf5c-ghwq"}],"prev":{"headline":"opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking","id":"CVE-2026-39883"},"products":["mcp-server-kubernetes"],"published":"2026-04-14","related":[{"cvss_score":9.3,"headline":"MCP Server Kubernetes \u003c 3.9.0 Argument Injection via kubectl Structured Tools","id":"CVE-2026-61459","kev_date_added":null,"published":"2026-07-10"},{"cvss_score":6.4,"headline":"mcp-server-kubernetes potential security issue in exec_in_pod tool","id":"CVE-2025-66404","kev_date_added":null,"published":"2025-12-03"}],"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":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-15","vendors":["Flux159"]},"summary":"Attackers can inject arbitrary kubectl flags via space-splitting in the port_forward tool, enabling network exposure or cross-namespace access.","url":"https://insights.sbomify.com/CVE-2026-39884/"}