CVE-2026-66066

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Source
https://cve.org/CVERecord?id=CVE-2026-66066
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66066.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-66066
Aliases
Downstream
Related
Published
2026-07-30T18:32:11.419Z
Modified
2026-08-03T03:30:21.721069071Z
Severity
  • 9.5 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
Details

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 secretkeybase 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.

Database specific 
{
    "cwe_ids": [
        "CWE-1188"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66066.json"
}
References

Affected packages

Git / github.com/rails/rails

Affected ranges

Type
GIT
Repo
https://github.com/rails/rails
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
72bc36fb47aa3a9b10149ecefc1f344d7b028d79
Introduced
80827ca7ff33ca3026f2c74fe8249ccc6f513318
Fixed
8ec292f5f95020b1e36ed68436fb46fe41302699
Fixed
beef74d4cebf42a01cd1df79e9de00df725b64fd
Fixed
3989ebf3473d71e4ceca28154b0b57b5bf22db24
Fixed
1c01bb587206ee6eb0e1179c2cef96a6a47acb1e
Fixed
349e7a5d5b4b715af1e416db824f3c078a7d59e5
Fixed
d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.2.3.2"
        },
        {
            "introduced": "8.0.0.beta1"
        },
        {
            "fixed": "8.0.5.1"
        },
        {
            "introduced": "8.1.0.beta1"
        },
        {
            "fixed": "8.1.3.1"
        }
    ]
}

Affected versions

v0.*
v0.10.0
v0.10.1
v0.11.0
v0.11.1
v0.12.0
v0.13.0
v0.13.1
v0.14.1
v0.14.3
v0.9.1
v0.9.2
v0.9.3
v0.9.4
v0.9.4.1
v0.9.5
v1.*
v1.1.0
v1.1.0_RC1
v1.1.1
v2.*
v2.0.0
v2.0.0_PR
v2.0.0_RC1
v2.0.0_RC2
v2.0.1
v3.*
v3.0.0.beta.3
v3.0.0.beta3
v3.1.0.beta1
v3.1.0.rc1
v3.2.0.rc1
v4.*
v4.0.0.beta1
v4.0.0.rc1
v4.2.0.beta1
v5.*
v5.0.0.beta1
v5.0.0.beta2
v5.0.0.beta4
v5.1.0.beta1
v6.*
v6.0.0.beta1
v6.0.0.beta2
v6.1.0.rc1
v7.*
v7.0.0.alpha1
v7.0.0.alpha2
v7.1.0.beta1
v7.2.0.beta1
v7.2.0.beta2
v7.2.0.beta3
v7.2.0.rc1
v7.2.1
v7.2.2
v7.2.3
v7.2.3.1
v8.*
v8.0.0
v8.0.0.beta1
v8.0.0.rc1
v8.0.0.rc2
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.0.5
v8.1.0
v8.1.0.beta1
v8.1.0.rc1
v8.1.1
v8.1.2
v8.1.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66066.json"