{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "incident": {
    "id": "cve-2026-55107",
    "url": "https://cveboard.org/i/cve-2026-55107",
    "urlPt": "https://cveboard.org/pt/i/cve-2026-55107",
    "json": "https://cveboard.org/i/cve-2026-55107.json",
    "kind": "vuln",
    "live": false,
    "knownExploited": false,
    "severity": "critical",
    "title": "kobako Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)",
    "summary": "A guest mruby script running inside the Kobako sandbox can execute arbitrary Ruby in the host process, fully escaping the sandbox.",
    "titlePt": null,
    "summaryPt": null,
    "affected": [
      {
        "vendor": "elct9620",
        "product": "kobako",
        "defaultStatus": "unknown",
        "versions": [
          {
            "version": ">= 0.1.0, < 0.9.1",
            "status": "affected",
            "lessThan": null,
            "lessThanOrEqual": null
          }
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        "fixed": []
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    "references": [
      {
        "url": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h",
        "tag": "exploit"
      }
    ],
    "cwes": [
      {
        "id": "CWE-94",
        "name": "Improper Control of Generation of Code ('Code Injection')"
      },
      {
        "id": "CWE-470",
        "name": "Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')"
      }
    ],
    "ssvc": {
      "exploitation": "poc",
      "automatable": "yes",
      "impact": "total",
      "at": "2026-09-30T19:48:55.982Z"
    },
    "fix": "listed",
    "tags": [
      "elct9620",
      "rubygems"
    ],
    "cves": [
      "CVE-2026-55107"
    ],
    "ghsa": "GHSA-7pwq-q9jf-539h",
    "cvss": {
      "score": 10,
      "version": "3.1",
      "by": "GitHub"
    },
    "epss": {
      "percentage": 0.00799,
      "percentile": 0.56282,
      "asOf": "2026-10-26",
      "by": "FIRST"
    },
    "packages": [
      {
        "ecosystem": "rubygems",
        "name": "kobako",
        "vulnerable": ">= 0.1.0, <= 0.9.0",
        "fixed": "0.9.1",
        "advisory": "GHSA-7pwq-q9jf-539h"
      }
    ],
    "vendor": "elct9620",
    "product": "kobako",
    "kev": null,
    "breach": null,
    "retracted": false,
    "sources": [
      {
        "label": "cve.now",
        "url": "https://cve.now/CVE-2026-55107"
      },
      {
        "label": "GitHub Advisory Database",
        "url": "https://github.com/advisories/GHSA-7pwq-q9jf-539h"
      }
    ],
    "cveVersion": 1,
    "cvePending": false,
    "publishedAt": "2026-08-18T20:09:59.000Z",
    "updatedAt": "2026-09-30T17:06:00.286Z"
  },
  "live": false,
  "events": [
    {
      "id": "cvenow:CVE-2026-55107:cvenow_discovered:first",
      "incidentId": "cve-2026-55107",
      "type": "cvenow_discovered",
      "at": "2026-09-30T17:06:00.286Z",
      "detail": {}
    },
    {
      "id": "ghsa:GHSA-7pwq-q9jf-539h:ghsa_published:2026-08-18T20:09:59.000Z",
      "incidentId": "cve-2026-55107",
      "type": "ghsa_published",
      "at": "2026-08-18T20:09:59.000Z",
      "detail": {
        "ghsa": "GHSA-7pwq-q9jf-539h",
        "severity": "critical",
        "fixed": "0.9.1"
      }
    }
  ]
}