CVE-2026-66066: falha crítica em rails
Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
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99Vexday Risk Score
Corrija agora. Ela exploração observada pelo VulnCheck, tem alerta oficial do governo brasileiro e tem exploit funcional público.
ssvc Actcvss 9.5epss 30%
da publicação à armano mesmo dia
Publicada no NVD30 de jul.
1ª PoC29 de jul.
metasploit29 de jul.
VulnCheck+26d
Alerta oficial no Brasil
O governo federal publicou alerta, recomendação ou boletim que cita esta vulnerabilidade.
- CISC Gov.br · 04 ago 2026Boletim do CISC de Vulnerabilidadeler no gov.br ↗
Fonte: CTIR Gov (GSI) e CISC Gov.br, sob licença CC BY-ND 3.0.
Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Produtos afetados
rails · railsPoCs públicas encontradas — 14
githubgithub.com/rails/rails-forensics-CVE-2026-66066★ 30githubgithub.com/Zer0SumGam3/CVE-2026-66066-POC★ 23githubgithub.com/0xsha/KindaRails2Shell★ 5githubgithub.com/HackSpeak/CVE-2026-66066★ 4githubgithub.com/HackSpeak/kindarails2shell-poc★ 2githubgithub.com/shinthink/CVE-2026-66066★ 1githubgithub.com/0xBlackash/CVE-2026-66066★ 1githubgithub.com/ivanesk315/CVE-2026-66066★ 0githubgithub.com/paveg/rails-activestorage-vips-audit★ 0vulncheckvulncheck.com/xdb/57cebda1c107não verificadovulncheckvulncheck.com/xdb/0508fd6a8482não verificadovulncheckvulncheck.com/xdb/8e188286dd07não verificadovulncheckvulncheck.com/xdb/2e9410c90400não verificadovulncheckvulncheck.com/xdb/c47a6f0ceee6não verificado⚠ Recursos públicos, para você avaliar a exposição de sistemas que controla ou está autorizado a testar. Teste apenas com autorização.
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Referências
https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1ehttps://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49ahttps://github.com/rails/rails-forensics-CVE-2026-66066https://github.com/rails/rails/releases/tag/v7.2.3.2https://github.com/rails/rails/releases/tag/v8.0.5.1https://github.com/rails/rails/releases/tag/v8.1.3.1https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrmhttps://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.ymlhttps://thehackernews.com/2026/07/critical-rails-flaw-could-let.htmlhttp://www.openwall.com/lists/oss-security/2026/07/29/9