CVEvulnerability

CVE-2026-55107

10.0 CRITICAL Published 2026-09-30 Modified 2026-09-30 Official page ↗
Status
Deferred
Published
2026-09-30
Last modified
2026-09-30
Assigner
[email protected]
CVSS 3.1 ([email protected])
10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-470, CWE-94

Description

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.

Related

Weakness · CWE (2)

  • CWE-470 Use of Externally-Controlled Input to Select Classes or Code weakness
  • CWE-94 Improper Control of Generation of Code weakness

References