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vuln-cve/data/2026/55xxx/CVE-2026-55107.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-55107",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-06-16T14:41:54.579Z",
"datePublished": "2026-09-30T17:06:00.286Z",
"dateUpdated": "2026-09-30T19:49:04.193Z"
},
"containers": {
"cna": {
"title": "Kobako Vulnerable to Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-94",
"lang": "en",
"description": "CWE-94: Improper Control of Generation of Code ('Code Injection')",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-470",
"lang": "en",
"description": "CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')",
"type": "CWE"
}
]
}
],
"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"
}
}
],
"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"
}
],
"affected": [
{
"vendor": "elct9620",
"product": "kobako",
"versions": [
{
"version": ">= 0.1.0, < 0.9.1",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-09-30T17:06:00.286Z"
},
"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."
}
],
"source": {
"advisory": "GHSA-7pwq-q9jf-539h",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"references": [
{
"url": "https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-09-30T19:48:55.982496Z",
"id": "CVE-2026-55107",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-09-30T19:49:04.193Z"
}
}
]
}
}