Critical severity10.0NVD Advisory· Published Sep 30, 2026· Updated Sep 30, 2026
CVE-2026-55107
CVE-2026-55107
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
kobakoRubyGems | >= 0.1.0, < 0.9.1 | 0.9.1 |
Affected products
2Patches
Vulnerability mechanics
References
4News mentions
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