{"id":"CVE-2026-66066","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-66066","generatedAt":"2026-10-31T03:53:36.806Z","title":"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.","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.","published":"2026-07-30T19:18:36.000Z","lastModified":"2026-09-10T20:36:14.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":9.5,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1188"],"affected":[],"epss":{"score":0.30071,"percentile":0.98209,"date":"2026-10-30","history":[{"date":"2026-09-24","score":0.02099,"percentile":0.80887},{"date":"2026-10-08","score":0.27861,"percentile":0.98054},{"date":"2026-10-25","score":0.26518,"percentile":0.97998},{"date":"2026-10-29","score":0.30071,"percentile":0.98207}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 30.1%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-08T00:00:00.000Z","detail":{"to":0.27861,"from":0.02099,"percentile":0.98054},"summary":"EPSS moved from 2.1% to 27.9% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-24T00:00:00.000Z","detail":{"to":0.02099,"from":0.27861,"percentile":0.80887},"summary":"EPSS moved from 27.9% to 2.1% probability of exploitation in the next thirty days."}],"references":[{"url":"https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.2","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.1","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.3.1","source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm","source":"security-advisories@github.com"},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml","source":"security-advisories@github.com"},{"url":"https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html","source":"security-advisories@github.com"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/29/9","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2026/08/01/6","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/rails/rails-forensics-CVE-2026-66066","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-66066","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}