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TI-2026-34208 Aliases CVE-2026-46519GHSA-cr22-wjx7-2w6m

Incorrect authorization in Flux159 mcp-server-kubernetes

Priority HIGH 73CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00513 43rd percentileScored 2026-11-07
Fix Fixed mcp-server-kubernetes (Flux159): 3.6.0mcp-server-kubernetes (npm): 3.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Flux159mcp-server-kubernetesbefore 3.6.03.6.0Patch availableCNA
—mcp-server-kubernetes (npm)before 3.6.03.6.0Patch availableGHSA-cr22-wjx7-2w6m
  • mcp-server-kubernetes VendorFlux159 Affected before 3.6.0 Fixed in 3.6.0 Patch available CNA
  • mcp-server-kubernetes (npm) Vendor— Affected before 3.6.0 Fixed in 3.6.0 Patch available GHSA-cr22-wjx7-2w6m

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:suyogs:mcp-server-kubernetes:*:*:*:*:*:*:*:*——Flux159
  • cpe:2.3:a:suyogs:mcp-server-kubernetes:*:*:*:*:*:*:*:* Versions — — ·Flux159

Remediation

  • Fix · CNA mcp-server-kubernetes (Flux159) Fixed in 3.6.0
  • Fix · GHSA-cr22-wjx7-2w6m mcp-server-kubernetes (npm) Fixed in 3.6.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46519
  2. 2026-10-03 Alias added: GHSA-cr22-wjx7-2w6m

References

Advisory 1

Other 3

  • TI-2026-44064 MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools CVSS 4.0CRITICAL 9.3
  • TI-2025-40841 mcp-server-kubernetes potential security issue in exec_in_pod tool CVSS 3.1HIGH 8.8
  • TI-2026-28763 MCP Server Kubernetes has Argument Injection in its port_forward tool via space-splitting CVSS 3.1HIGH 8.3
  • TI-2026-06677 Flux159 mcp-game-asset-gen MCP index.ts image_to_3d_async path traversal CVSS 4.0MEDIUM 6.9
  • TI-2025-33320 mcp-server-kubernetes vulnerable to command injection in several tools CVSS 3.1HIGH 7.5
  • TI-2026-34833 mcp-server-kubernetes: kubectl-generic flag injection enables Kubernetes bearer token exfiltration CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences