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CVE-2026-39884

mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Versions 3.4.0 and prior contain an argument injection vulnerability in the port_forward tool in src/tools/port_forward.ts, where a kubectl command is constructed via string concatenation with user-controlled input and then naively split on spaces before being passed to spawn(). Unlike all other tools in the codebase which correctly use array-based argument passing with execFileSync(), port_forward treats
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a79187bf4d9a7c7d563fd37855b225529c3ca27d4d305a23c86a5d42740f615c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"mcp-server-kubernetes","vendor":"Flux159","versions":[{"status":"affected","version":"< 3.5.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-88","description":"CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.5.0","tags":["x_refsource_MISC"],"url":"https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.5.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-4xqg-gf5c-ghwq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/adp/0/references/0
{"name":"https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-4xqg-gf5c-ghwq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-4xqg-gf5c-ghwq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:02a31e15c1046a8db149177f51b4db7f54368cd17d3c2943111b8ed9d2b02279 · sha256:59e73591c52024a1… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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