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CVE-2026-66066 is a critical arbitrary file-read vulnerability in Ruby on Rails Active Storage when image processing is performed with libvips on untrusted uploads. The flaw exists at the trust boundary between Active Storage and libvips: untrusted attachments could be passed to unsafe libvips operations by the Active Storage analyzer and transformer, allowing a crafted image upload to trigger disclosure of files readable by the Rails worker process. Affected deployments include Rails applications using Active Storage with libvips for image processing, including default configurations in newer Rails branches where Vips is the default processor. Successful exploitation can expose the Rails process environment and sensitive application material such as framework secrets, database credentials, cloud storage credentials, and API tokens.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.