{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-39987",
  "revision": 1,
  "title": "marimo — unauthenticated shell through the terminal socket",
  "summary": "marimo before 0.23.0 accepts connections on its terminal socket without checking who is asking, so anyone who can reach the notebook gets a full interactive shell and runs commands on the host.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.99564,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2026-04-23",
    "prerequisites": "Network access to a marimo notebook running in a mode that enables the terminal; no credentials needed."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "marimo 0.23.0"
    ]
  },
  "mitre_attack": [
    "T1190"
  ],
  "kill_chain": "initial_access",
  "recommended_action": "Upgrade marimo to 0.23.0 or later now; exploit code appeared within hours of disclosure, so treat any exposed notebook host as compromised.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-39987",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2026-39987",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-39987",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39987",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/marimo-team/marimo/pull/9098"
    },
    {
      "type": "exploit",
      "url": "https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc"
    }
  ],
  "published_at": "2026-04-09T18:17:02.807Z",
  "issued_at": "2026-09-24T08:51:39.744Z",
  "tags": [
    "marimo",
    "python",
    "notebook",
    "missing-authentication",
    "remote-code-execution",
    "kev"
  ]
}