{"action":"Upgrade erb to 4.0.3.1 or later.","affected":[{"fixed":"4.0.3.1","introduced":"0"},{"fixed":"4.0.4.1","introduced":"4.0.4"},{"fixed":"6.0.1.1","introduced":"5.0.0"},{"fixed":"6.0.4","introduced":"6.0.2"}],"component":"erb","cve_ids":["CVE-2026-41316"],"ecosystem":"RubyGems","epss":0.01306,"exploited":false,"fixed_versions":["4.0.3.1","4.0.4.1","6.0.1.1","6.0.4"],"ghsa_id":"GHSA-q339-8rmv-2mhv","id":"tcs_01M5KEMS8PR3XVCPDBSM4R1Q9D","modified_at":"2026-09-10T03:51:02.746201088Z","published_at":"2026-04-24T15:36:05Z","references":["https://osv.dev/vulnerability/GHSA-q339-8rmv-2mhv","https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv","https://nvd.nist.gov/vuln/detail/CVE-2026-41316","https://github.com/ruby/erb","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/erb/CVE-2026-41316.yml"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-q339-8rmv-2mhv","url":"https://osv.dev/vulnerability/GHSA-q339-8rmv-2mhv"}],"summary":"ERB has an @_init deserialization guard bypass via def_module / def_method / def_class"}