Security · 5 November 2026
Critical Rails flaw lets unauthenticated attackers write server files via crafted ImageMagick uploads
A critical Ruby on Rails flaw in Active Storage allows unauthenticated attackers to write arbitrary files by uploading crafted images processed by ImageMagick; the issue is fixed in Rails 8.1.4.1 and 8.0.5.2 and rated 9.8 CVSS.
Why it matters
Update your product’s file‑upload handling to avoid Active Storage’s ImageMagick path or enforce strict coder limits.
For product managers
For your product
What does this mean for your product?
Try it on your product More from this issueAll AI news from 5 Nov →
Get this every morning, written for your product.
Deltaday reads the whole AI news cycle and tells you what changed, whether it's real yet, and what to do about it.