PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-46519 Flux159 CVE debrief

CVE-2026-46519 is a high-severity vulnerability in mcp-server-kubernetes, a Model Context Protocol server for Kubernetes cluster management. The issue arises from ineffective access controls, where environment variables ALLOW_ONLY_READONLY_TOOLS, ALLOW_ONLY_NON_DESTRUCTIVE_TOOLS, and ALLOWED_TOOLS are not enforced at the execution layer (tools/call). This allows any client that knows a tool name to invoke it directly, regardless of the configured restriction mode, effectively making the access control cosmetic. The vulnerability has been patched in version 3.6.0.

Vendor
Flux159
Product
mcp-server-kubernetes
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-06-11
Advisory published
2026-06-11
Advisory updated
2026-06-11

Who should care

Users of mcp-server-kubernetes prior to version 3.6.0 should be aware of this vulnerability, as it allows unauthorized Kubernetes operations.

Technical summary

The vulnerability has a CVSS score of 8.8 and is classified as HIGH severity. It was published on [cvePublishedAt] and modified on [cveModifiedAt]. The CVE record can be found at [resourceLinkAnnotations:cve-org].

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to version 3.6.0 or later
  • Review and restrict tool access based on organizational needs

Evidence notes

The vulnerability was patched in version 3.6.0. More information can be found at [resourceLinkAnnotations:ref-4] and [resourceLinkAnnotations:ref-5].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46519 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46519

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46519 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46519

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.