Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
rails rails — Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L P N N H H H 9.5 .0177 76.3 —
AFFECTED
Product Versions Fixed
rails < 7.2.3.2 – —
TIMELINE
Jul 23 Reserved by GitHub_M
Jul 30 Published (CNA: GitHub_M)
Jul 31 EXPLOIT PUBLISHED — CVE-2026-66066 (rails). Public exploit reference added.
Description
Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 23, 2026 | Reserved | Reserved by GitHub_M |
| July 30, 2026 | Published | Published (CNA: GitHub_M) |
| July 31, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-66066 (rails). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| rails | rails | — | < 7.2.3.2 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66066 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.