9.5

CVE-2026-66066

Trending CVE
Medienbericht

Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerrails
≫
Produkt rails
Version < 7.2.3.2
Status affected
Version >= 8.0.0.beta1, < 8.0.5.1
Status affected
Version >= 8.1.0.beta1, < 8.1.3.1
Status affected
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.7% 0.749
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 9.5 0 0
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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-1188 Initialization of a Resource with an Insecure Default

The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.

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03.08.2026 16:28
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Media Report
01.08.2026 16:42
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01.08.2026 11:42
https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm
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
https://github.com/rails/rails/releases/tag/v8.1.3.1
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml
https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html
http://www.openwall.com/lists/oss-security/2026/07/29/9
https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066
http://www.openwall.com/lists/oss-security/2026/08/01/6