{"cve":"CVE-2026-66066","nvd":{"published":"2026-07-30T19:18:35.843","modified":"2026-09-10T20:36:14.340","status":"Awaiting Analysis","description":"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_v4":{"vector":"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","score":9.5},"cvss_v3":null,"cwes":["CWE-1188"],"references":["https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e","https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5","https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a","https://github.com/rails/rails/releases/tag/v7.2.3.2","https://github.com/rails/rails/releases/tag/v8.0.5.1"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-66066","score":0.30071,"percentile":0.98211,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xr9x-r78c-5hrm","url":"https://osv.dev/vulnerability/GHSA-xr9x-r78c-5hrm","summary":"Active Storage has possible arbitrary file read and remote code execution in Active Storage variant processing","modified":"2026-09-10T03:51:12.686410422Z","packages":[{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":["<7.2.3.2"],"fixed":["7.2.3.2"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.0.0.beta1 <8.0.5.1"],"fixed":["8.0.5.1"]},{"ecosystem":"RubyGems","name":"activestorage","purl":"pkg:gem/activestorage","ranges":[">=8.1.0.beta1 <8.1.3.1"],"fixed":["8.1.3.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}