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CVE-2026-66066

CVE-2026-66066 · Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.5 · Critical · EPSS 30.1% · Public exploit · Fix available

Published
Updated

Stack: system

Affected products and versions

  • rails

    Versions
    • < 7.2.3.2: Affected
    • >= 8.0.0.beta1, < 8.0.5.1: Affected
    • >= 8.1.0.beta1, < 8.1.3.1: Affected

    No fix published

  • rails Debian:12

    Versions
    • 2:6.1.7.10+dfsg-1~deb12u1
    • 2:6.1.7.10+dfsg-1~deb12u2
    • 2:6.1.7.3+dfsg-1
    • 2:6.1.7.3+dfsg-10
    • 2:6.1.7.3+dfsg-11
    • 2:6.1.7.3+dfsg-12
    • 2:6.1.7.3+dfsg-13
    • 2:6.1.7.3+dfsg-2
    • 2:6.1.7.3+dfsg-2~deb12u1
    • 2:6.1.7.3+dfsg-3
    • 2:6.1.7.3+dfsg-4
    • 2:6.1.7.3+dfsg-5
    • 2:6.1.7.3+dfsg-6
    • 2:6.1.7.3+dfsg-7
    • 2:6.1.7.3+dfsg-7~exp1
    • 2:6.1.7.3+dfsg-8
    • 2:6.1.7.3+dfsg-9
    Affected ranges
    • ECOSYSTEM: < 2:6.1.7.10+dfsg-1~deb12u3

    Update to 2:6.1.7.10+dfsg-1~deb12u3

  • rails Debian:13

    Versions
    • 2:7.2.2.1+dfsg-7
    • 2:7.2.2.2+dfsg-1
    • 2:7.2.2.2+dfsg-2~deb13u1
    Affected ranges
    • ECOSYSTEM: < 2:7.2.2.2+dfsg-2~deb13u2

    Update to 2:7.2.2.2+dfsg-2~deb13u2

  • rails Debian:14

    Versions
    • 2:7.2.2.1+dfsg-7
    • 2:7.2.2.2+dfsg-1
    • 2:7.2.2.2+dfsg-2
    • 2:7.2.2.2+dfsg-2~deb13u1
    • 2:7.2.2.2+dfsg-2~deb13u2
    • 2:7.2.3+dfsg-1
    • 2:7.2.3+dfsg-2
    • 2:7.2.3+dfsg-3
    • 2:7.2.3.1+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 2:7.2.3.2+dfsg-1

    Update to 2:7.2.3.2+dfsg-1

  • rails Ubuntu:Pro:16.04:LTS

    Versions
    • 2:4.1.10-1
    • 2:4.2.5-1
    • 2:4.2.5.1-1
    • 2:4.2.5.2-2
    • 2:4.2.6-1
    • 2:4.2.6-1ubuntu0.1~esm1
    • 2:4.2.6-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:18.04:LTS

    Versions
    • 2:4.2.9-2
    • 2:4.2.9-4
    • 2:4.2.10-0ubuntu4
    • 2:4.2.10-0ubuntu4+esm1
    • 2:4.2.10-0ubuntu4+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:20.04:LTS

    Versions
    • 2:5.2.2.1+dfsg-1ubuntu1
    • 2:5.2.3+dfsg-3
    • 2:5.2.3+dfsg-3ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:Pro:22.04:LTS

    Versions
    • 2:6.0.3.7+dfsg-2
    • 2:6.1.4.1+dfsg-8ubuntu2
    • 2:6.1.4.1+dfsg-8ubuntu2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:24.04:LTS

    Versions
    • 2:6.1.7.3+dfsg-2build1
    • 2:6.1.7.3+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:26.10

    Versions
    • 2:7.2.3+dfsg-2
    • 2:7.2.3.2+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rails Ubuntu:26.04:LTS

    Versions
    • 2:7.2.2.1+dfsg-7
    • 2:7.2.2.2+dfsg-2
    • 2:7.2.3+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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