CVE-2026-61459 json
MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools
published 2026-07-10 4 mo ago modified 2026-11-08 24 h ago also EUVD-2026-42987 , GHSA-wmg3-h8mf-wgvr , PYSEC-2026-3685
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.4%
- EPSS 2.4% chance of exploitation in 30 days, percentile 83%
- public exploits
- 1
- Exploit-DB
Summary
MCP Server Kubernetes before 3.9.0 contains an argument injection vulnerability in structured tools (kubectl_get, kubectl_describe, kubectl_delete) that allows attackers to bypass the assertNoDangerousFlags security check by supplying resourceType and name parameters with leading dashes. Attackers can inject the --server flag to redirect kubectl commands to an attacker-controlled API server, causing the operator's bearer token to be transmitted externally and enabling full cluster compromise.
Patch / fix
- npm mcp-server-kubernetes 3.9.0
- pypi mcp-server-kubernetes 3.9.0
- Flux159 mcp-server-kubernetes 3.9.0
Timeline
- Published
- First public exploit (EDB-52638)
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
2.36% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-52638 mcp-server-kubernetes 3.8.x - Argument Injection remote, 2026-08-11
- github.com https://github.com/Flux159/mcp-server-kubernetes/issues/328 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | mcp-server-kubernetes | <3.9.0 |
3.9.0 |
| pypi | mcp-server-kubernetes | <3.9.0 |
3.9.0 |
Affected products
- Flux159 mcp-server-kubernetes
Classification
- Weakness
-
- CWE-88 Improper Neutralization of Argument Delimiters in a Command
References
-
github.com
/Flux159/mcp-server-kubernetes/pull/329
issue-tracking, patch, web
-
github.com
/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9a
patch, web
-
github.com
/Flux159/mcp-server-kubernetes/issues/328
exploit, technical-description, issue-tracking, web, mitigation, vendor-advisory
-
github.com
/Flux159/mcp-server-kubernetes/releases/tag/3.9.0
release-notes, web
-
vulncheck.com
/advisories/mcp-server-kubernetes-argument-injection-via-kubectl-structured-tools
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-61459
advisory
-
github.com
/Flux159/mcp-server-kubernetes
package
-
pypi.org
/project/mcp-server-kubernetes
package
-
github.com
/advisories/GHSA-wmg3-h8mf-wgvr
advisory
Sources
- CVE List CVE-2026-61459
- GitHub Advisory GHSA-wmg3-h8mf-wgvr
- NVD CVE-2026-61459
- OSV PYSEC-2026-3685
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