major vulnerability· requires attention

Affects Ruby on Rails ActiveStorage, a widely used web framework component; allows server file read/write and secret exposure, risking breaches and RCE across many web apps.

Web

CVE-2026-122006

9.8

Critical

EPSS n/aPatch available

ActiveStorage ImageMagick analyzer enables server read/write, risking secret exposure.

exploited

No known exploitation not in CISA KEV as of our last sync

fix

Patch available see the advisory in the references

likelihood

No EPSS score yet

Published 4 Nov 2026Analysed here 5 Nov 2026CVSS scored by the publisher (CNA)

common questions

Is CVE-2026-122006 being exploited?

Not confirmed. CVE-2026-122006 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.

How severe is CVE-2026-122006?

CVE-2026-122006 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-122006?

Yes. A fix has been recorded for CVE-2026-122006. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-122006 affect?

CVE-2026-122006 affects Ruby on Rails activestorage < 8.1.4.1, Applications using ImageMagick for attachment processing. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-122006?

Upgrade activestorage to 8.1.4.1+ and enforce ImageMagick security policy.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

Ruby on Rails activestorage < 8.1.4.1Applications using ImageMagick for attachment processing

impact

Attacker can trigger ImageMagick analysis on uploads to read/write server files (expose secret_key_base) and potentially enable RCE.

action required

Immediate action required

affected versions

rubyonrails Active Storage

affected< 8.0.5.2
affected>= 8.1 and < 8.1.4.1

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

timeline

4 Nov 2026Published
4 Nov 2026CVE record last updated · same day later
5 Nov 2026Analysed by vulneraibility.com · same day later

also known as

GHSA-f3w6-w445-fwh9

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

5 references in the CVE record: 5 links

Linkgithub.com /rails/rails/security/advisories/GHSA-f3w6-w445-fwh9
Linkgithub.com /rails/rails/releases/tag/v8.1.4.1
Linkgithub.com /rails/rails/releases/tag/v8.0.5.2
Linkgithub.com /digitalocean/droplet-1-clicks/pull/488
Linkgithub.com /rubysec/ruby-advisory-db/pull/1300

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
FIRST EPSS: exploit probability and percentile
OSV: advisory aliases and downstream package versions
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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