{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-46519: mcp-server-kubernetes Affected By Tool Access Control Bypass: Presentation-Layer Filtering Without Execution-Layer Enforcement","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-46519","status":"final","version":"1","initial_release_date":"2026-06-11T18:34:15.281Z","current_release_date":"2026-06-11T19:40:22.771Z","revision_history":[{"date":"2026-06-11T18:34:15.281Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Prior to version 3.6.0, mcp-server-kubernetes exposes three environment variables (ALLOW_ONLY_READONLY_TOOLS, ALLOW_ONLY_NON_DESTRUCTIVE_TOOLS, ALLOWED_TOOLS) documented as access controls for restricting which Kubernetes operations are available. These controls are enforced at the tool discovery layer (tools/list) but not at the execution layer (tools/call). Any client that knows a tool name can invoke it directly regardless of the configured restriction mode. The access control was effectively cosmetic. This issue has been patched in version 3.6.0.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-46519 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-46519"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-46519"},{"category":"external","summary":"https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-cr22-wjx7-2w6m","url":"https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-cr22-wjx7-2w6m"},{"category":"external","summary":"https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.6.0","url":"https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.6.0"}]},"product_tree":{"branches":[{"category":"vendor","name":"Flux159","branches":[{"category":"product_name","name":"mcp-server-kubernetes","branches":[{"category":"product_version","name":"< 3.6.0","product":{"name":"Flux159 mcp-server-kubernetes < 3.6.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:flux159:mcp-server-kubernetes:\\<_3.6.0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-46519","title":"mcp-server-kubernetes Affected By Tool Access Control Bypass: Presentation-Layer Filtering Without Execution-Layer Enforcement","notes":[{"category":"description","text":"mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Prior to version 3.6.0, mcp-server-kubernetes exposes three environment variables (ALLOW_ONLY_READONLY_TOOLS, ALLOW_ONLY_NON_DESTRUCTIVE_TOOLS, ALLOWED_TOOLS) documented as access controls for restricting which Kubernetes operations are available. These controls are enforced at the tool discovery layer (tools/list) but not at the execution layer (tools/call). Any client that knows a tool name can invoke it directly regardless of the configured restriction mode. The access control was effectively cosmetic. This issue has been patched in version 3.6.0.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}