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    2 vulnerabilities found for kobako by elct9620

    CVE-2026-55107 (GCVE-0-2026-55107)

    Vulnerability from nvd – Published: 2026-09-30 17:06 – Updated: 2026-09-30 17:06
    VLAI
    Title
    Kobako Vulnerable to Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)
    Summary
    Kobako is a Ruby gem that embeds a Wasm-isolated mruby interpreter inside applications, allowing execution of untrusted Ruby scripts (LLM-generated code, user formulas, student submissions, third-party plugins) in-process without giving them access to host memory, files, network, or credentials. From version 0.1.0 to before version 0.9.1, a guest mruby script running inside the Kobako sandbox can execute arbitrary Ruby in the host process, fully escaping the sandbox. This issue has been patched in version 0.9.1.
    Severity
    10 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    CWE
    • CWE-94 - Improper Control of Generation of Code ('Code Injection')
    • CWE-470 - Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    elct9620 kobako Affected: >= 0.1.0, < 0.9.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "kobako",
          "vendor": "elct9620",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.1.0, \u003c 0.9.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Kobako is a Ruby gem that embeds a Wasm-isolated mruby interpreter inside applications, allowing execution of untrusted Ruby scripts (LLM-generated code, user formulas, student submissions, third-party plugins) in-process without giving them access to host memory, files, network, or credentials. From version 0.1.0 to before version 0.9.1, a guest mruby script running inside the Kobako sandbox can execute arbitrary Ruby in the host process, fully escaping the sandbox. This issue has been patched in version 0.9.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-470",
              "description": "CWE-470: Use of Externally-Controlled Input to Select Classes or Code (\u0027Unsafe Reflection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-30T17:06:00.286Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h"
        },
        {
          "name": "https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f44987b3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f44987b3"
        },
        {
          "name": "https://github.com/elct9620/kobako/releases/tag/v0.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/elct9620/kobako/releases/tag/v0.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-7pwq-q9jf-539h",
        "discovery": "UNKNOWN"
      },
      "title": "Kobako Vulnerable to Sandbox Escape: guest eval reaches host RCE via method_missing \u2192 public_send (any bound Service)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55107",
    "datePublished": "2026-09-30T17:06:00.286Z",
    "dateReserved": "2026-06-16T14:41:54.579Z",
    "dateUpdated": "2026-09-30T17:06:00.286Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-55107 (GCVE-0-2026-55107)

    Vulnerability from cvelistv5 – Published: 2026-09-30 17:06 – Updated: 2026-09-30 17:06
    VLAI
    Title
    Kobako Vulnerable to Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)
    Summary
    Kobako is a Ruby gem that embeds a Wasm-isolated mruby interpreter inside applications, allowing execution of untrusted Ruby scripts (LLM-generated code, user formulas, student submissions, third-party plugins) in-process without giving them access to host memory, files, network, or credentials. From version 0.1.0 to before version 0.9.1, a guest mruby script running inside the Kobako sandbox can execute arbitrary Ruby in the host process, fully escaping the sandbox. This issue has been patched in version 0.9.1.
    Severity
    10 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    CWE
    • CWE-94 - Improper Control of Generation of Code ('Code Injection')
    • CWE-470 - Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    elct9620 kobako Affected: >= 0.1.0, < 0.9.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "kobako",
          "vendor": "elct9620",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.1.0, \u003c 0.9.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Kobako is a Ruby gem that embeds a Wasm-isolated mruby interpreter inside applications, allowing execution of untrusted Ruby scripts (LLM-generated code, user formulas, student submissions, third-party plugins) in-process without giving them access to host memory, files, network, or credentials. From version 0.1.0 to before version 0.9.1, a guest mruby script running inside the Kobako sandbox can execute arbitrary Ruby in the host process, fully escaping the sandbox. This issue has been patched in version 0.9.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-470",
              "description": "CWE-470: Use of Externally-Controlled Input to Select Classes or Code (\u0027Unsafe Reflection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-30T17:06:00.286Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h"
        },
        {
          "name": "https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f44987b3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f44987b3"
        },
        {
          "name": "https://github.com/elct9620/kobako/releases/tag/v0.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/elct9620/kobako/releases/tag/v0.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-7pwq-q9jf-539h",
        "discovery": "UNKNOWN"
      },
      "title": "Kobako Vulnerable to Sandbox Escape: guest eval reaches host RCE via method_missing \u2192 public_send (any bound Service)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55107",
    "datePublished": "2026-09-30T17:06:00.286Z",
    "dateReserved": "2026-06-16T14:41:54.579Z",
    "dateUpdated": "2026-09-30T17:06:00.286Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}