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Ruby on Rails patches critical CVSS 9.5 flaw, urges update
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Fusion42 · 2 August 2026 · Fusion42 review
Ruby on Rails released a patch for a critical CVSS 9.5 arbitrary file read vulnerability (CVE-2026-66066) that allows unauthenticated attackers to execute remote code and access secret environment variables. Administrators are urged to update Active Storage and libvips versions immediately to block the flaw and mitigate leaked secrets.
This Wire brief sits within Fusion42's coverage of Enterprise Software.
◆ ◆ The Wire takeaway
You face urgent risk from a critical Ruby on Rails flaw exposing your server secrets and enabling remote code execution. Update Active Storage and libvips this week or your app could be compromised through leaked keys.
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1 source · 2 Aug 2026
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