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CVE-2026-66066

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ce4a877045623e495e8d1e4ca173d4bcba8a032cf78b52bebc2957b158341140
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"rails","vendor":"rails","versions":[{"status":"affected","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"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.5,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1188","description":"CWE-1188: Insecure Default Initialization of Resource","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/problemTypes/0/descriptions/0

Source references

12 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/07/29/9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/adp/0/references/0
{"url":"http://www.openwall.com/lists/oss-security/2026/08/01/6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/adp/0/references/2
{"url":"https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/adp/0/references/1
{"name":"https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/1
{"name":"https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/2
{"name":"https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/3
{"name":"https://github.com/rails/rails/releases/tag/v7.2.3.2","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v7.2.3.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/4
{"name":"https://github.com/rails/rails/releases/tag/v8.0.5.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.0.5.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/5
{"name":"https://github.com/rails/rails/releases/tag/v8.1.3.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.1.3.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/6
{"name":"https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/0
{"name":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml","tags":["x_refsource_MISC"],"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/7
{"name":"https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html","tags":["x_refsource_MISC"],"url":"https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:49aa70e784da40c1014fa3b89efec9bf3b591e28ab747203c2f710d9db4bf6bc · sha256:a393eef13f9a6bab… · /containers/cna/references/8

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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