CVE-2026-55107
CRITICAL
10,0
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
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.
94
Improper Control of Generation of Code ('Code Injection')
DraftCommon Consequences
Security Scopes Affected:
Access Control
Integrity
Confidentiality
Availability
Non-Repudiation
Potential Impacts:
Bypass Protection Mechanism
Gain Privileges Or Assume Identity
Execute Unauthorized Code Or Commands
Hide Activities
Applicable Platforms
Languages:
Interpreted
Technologies:
AI/ML
470
Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
DraftCommon Consequences
Security Scopes Affected:
Integrity
Confidentiality
Availability
Other
Potential Impacts:
Execute Unauthorized Code Or Commands
Alter Execution Logic
Dos: Crash, Exit, Or Restart
Other
Read Application Data
Applicable Platforms
Languages:
Java, PHP, Interpreted
https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f4498…
https://github.com/elct9620/kobako/releases/tag/v0.9.1
https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h