by Kastro
Paper/Archive/CVE-2026-122006

CVE-2026-122006

rubyonrails Active Storage — The activestorage gem before 8.1.4.1 for Ruby on Rails, when ImageMagick attachment processing occurs, can allow server read and write op…

CVSS 9.8
critical.is priorityof 100
29
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

The activestorage gem before 8.1.4.1 for Ruby on Rails, when ImageMagick attachment processing occurs, can allow server read and write operations (e.g., reading secret_key_base) because the ImageMagick analyzer runs when a file is attached, and there is not an ImageMagick security policy to block unintended functionality.

Affected

ProductAffectedFixed inSource
Active Storage< 8.0.5.28.0.5.2CNA
Active Storage8.1 – < 8.1.4.18.1.4.1CNA

Scores by source

mitre (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgithub.com/rails/rails/security/advisories/GHSA-f3w6-w445-fwh9refgithub.com/rails/rails/releases/tag/v8.1.4.1refgithub.com/rails/rails/releases/tag/v8.0.5.2