RubyGems/kobako CVE-2026-55107: critical 10, EPSS 0.80%
kobako Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)
Action: Upgrade kobako to 0.9.1 or later.
bundle update kobakoAffected
| introduced | fixed | last affected |
|---|---|---|
| 0.1.0 | 0.9.1 | - |
Fixed versions
| 0.9.1 |
Sources
- osv: GHSA-7pwq-q9jf-539h
- https://github.com/elct9620/kobako/security/advisories/GHSA-7pwq-q9jf-539h
- https://github.com/elct9620/kobako/commit/64f84700c81f44902bed9211318d5362f44987b3
- https://github.com/elct9620/kobako
- https://nvd.nist.gov/vuln/detail/CVE-2026-55107
- https://github.com/elct9620/kobako/releases/tag/v0.9.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/kobako/GHSA-7pwq-q9jf-539h.yml
CVE-2026-55107 · published · modified · JSON