EUVD-2026-51270
GHSA-xr9x-r78c-5hrm
Severity by source
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
Network-reachable unauthenticated upload endpoint; S:C because file read extends beyond Active Storage's trust boundary to arbitrary server paths and enables full RCE via Rails signing secrets.
Primary rating from Vendor (CNA).
CVSS VectorVendor
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
Lifecycle Timeline
4Description PRE-NVD
Articles & Coverage 1
AnalysisAI
Arbitrary file read and remote code execution in Ruby on Rails Active Storage's libvips-based variant processor allows unauthenticated remote attackers to upload a crafted file and invoke unsafe libvips 'unfuzzed' operations, disclosing arbitrary server files including process environment variables that typically contain secret_key_base and external service credentials. Applications using the libvips variant processor (the default since load_defaults 7.0) that accept image uploads from untrusted users across activestorage versions below 7.2.3.2, 8.0.5.1, and 8.1.3.1 are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two conditions must hold simultaneously. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 9.5 (Critical) with 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 accurately reflects the severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting a Rails 8.x SaaS platform that permits user profile image uploads crafts a file exploiting a non-web-image unfuzzed libvips loader. After uploading the file through the normal image upload endpoint, the attacker requests a URL that triggers variant generation; libvips invokes the unfuzzed operation on the crafted file and returns the contents of /proc/self/environ as image data. … |
| Remediation | The primary fix is upgrading the rails gem to 7.2.3.2, 8.0.5.1, or 8.1.3.1 as appropriate, and simultaneously upgrading libvips to version 8.13 or later - Rails patching alone is insufficient if the system libvips remains below 8.13. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Rails applications running Active Storage on versions below 7.2.3.2, 8.0.5.1, and 8.1.3.1; immediately disable or restrict image upload functionality or move it behind authentication to untrusted users. …
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External POC / Exploit Code
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