{"action":"Upgrade mruby to 2.1.2-1 or later.","affected":[{"fixed":"2.1.2-1","introduced":"0"}],"component":"mruby","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["2.1.2-1"],"id":"tcs_01M5NENSM3E93RNC2TJDNXTN5Z","modified_at":"2026-10-26T12:02:27.192291763Z","published_at":"2020-07-21T15:15:14.537Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-15866","https://security-tracker.debian.org/tracker/CVE-2020-15866"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-15866","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-15866"}],"summary":"mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function."}