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Public proof of conceptFix available

CVE-2026-46519

A public proof of concept exists; no exploitation attested.

  • Published2026-06-11
  • Fixed in3.6.0
  • WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-06-1119:16CVE publishedNVD

Versions per branch

OSV
mcp-server-kubernetes
BranchAffectedFixed in
3.6< 3.6.03.6.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Flux159 mcp-server-kubernetes
    Affected
    • = < 3.6.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-11

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • atrilopenSUSE:Tumbleweedall versions · fixed in 1.28.4-1.1
  • atrilopenSUSE:Leap 16.0all versions · fixed in 1.28.4-bp160.1.1

Full record on NVD

Fix

  1. Update mcp-server-kubernetes to 3.6.0

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-26
  • CISA-ADPSSVC decisionpoc2026-06-11
  • CNACVSS 3.18.8known since 2026-10-26
  • CNAweakness (CWE)CWE-863known since 2026-10-26
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-05-21

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-06-11
Last Modified
2026-10-26
NVD status
Deferred
GitHub Advisory
GHSA-cr22-wjx7-2w6m

Frequently asked questions

What is CVE-2026-46519?

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.

Is CVE-2026-46519 actively exploited?

A proof-of-concept exploit exists for CVE-2026-46519, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-46519?

CVE-2026-46519 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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