{"action":"Upgrade kobako to 0.9.1 or later.","affected":[{"fixed":"0.9.1","introduced":"0.1.0"}],"component":"kobako","cve_ids":["CVE-2026-55107"],"ecosystem":"RubyGems","epss":0.00799,"exploited":false,"fixed_versions":["0.9.1"],"ghsa_id":"GHSA-7pwq-q9jf-539h","id":"tcs_01M5KEHSKZJRSWSV567TRV5GAK","modified_at":"2026-08-18T20:26:08.539217Z","published_at":"2026-08-18T20:09:59Z","references":["https://osv.dev/vulnerability/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"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"GHSA-7pwq-q9jf-539h","url":"https://osv.dev/vulnerability/GHSA-7pwq-q9jf-539h"}],"summary":"kobako Sandbox Escape: guest eval reaches host RCE via method_missing → public_send (any bound Service)"}