CVE-2026-66066: fallo crítico en rails
Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
99Vexday Risk Score
Corrige ahora. Ella explotación observada por VulnCheck, tiene alerta oficial del gobierno de Brasil y tiene exploit funcional público.
ssvc Actcvss 9.5epss 30%
de la publicación al armael mismo día
Publicada en NVD30 jul
1ª PoC29 jul
metasploit29 jul
VulnCheck+26d
Alerta oficial en Brasil
El gobierno federal de Brasil publicó una alerta, recomendación o boletín que cita esta vulnerabilidad.
- CISC Gov.br · 04 ago 2026Boletim do CISC de Vulnerabilidadeleer en gov.br ↗
Fuente: CTIR Gov (GSI) y CISC Gov.br, bajo licencia 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
Productos afectados
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/57cebda1c107no verificadovulncheckvulncheck.com/xdb/0508fd6a8482no verificadovulncheckvulncheck.com/xdb/8e188286dd07no verificadovulncheckvulncheck.com/xdb/2e9410c90400no verificadovulncheckvulncheck.com/xdb/c47a6f0ceee6no verificado⚠ Recursos públicos, para evaluar la exposición de sistemas que controlas o estás autorizado a probar. Prueba solo con autorización.
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Referencias
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