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Sunday, 13 September 2026
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Incident database

mcp-server-kubernetes access controls bypassable at tool execution layer (CVE-2026-46519)

Versions of mcp-server-kubernetes prior to 3.6.0 enforced their ALLOW_ONLY_READONLY_TOOLS, ALLOW_ONLY_NON_DESTRUCTIVE_TOOLS and ALLOWED_TOOLS restrictions only during tool discovery (tools/list), not at execution (tools/call), so any client knowing a tool name could invoke restricted Kubernetes operations. The issue was patched in version 3.6.0.

Disclosed 11 June 2026 · Record updated 13 September 2026

Impact

Clients could bypass configured read-only or non-destructive restrictions and execute any Kubernetes management tool exposed by the MCP server, making the documented access controls effectively cosmetic.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-46519