CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2026-122006 rubyonrails active storage
Critical (9.8) in rubyonrails active storage. EPSS 0.7% estimated probability of exploitation activity in the next 30 days. Fixed in activestorage 8.0.5.2, 8.1.4.1.
On this page
The activestorage gem before 8.1.4.1 for Ruby on Rails, when ImageMagick attachment processing occurs, can allow server read and write operations (e.g., reading secret_key_base) because the ImageMagick analyzer runs when a file is attached, and there is not an ImageMagick security policy to block unintended functionality.
Severity
- EPSS
- 0.7% (unchanged from 0.7% a week ago) estimated probability of exploitation activity in the next 30 days; 55th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: total, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-1188 Initialization of a Resource with an Insecure Default
- Published
- Modified
- Assigned by
- mitre (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- rubyonrails:active storage
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| rubyonrails Active Storage | before 8.0.5.2 |
| rubyonrails Active Storage | from 8.1 before 8.1.4.1 |
Fix and patched versions
activestorage(RubyGems): fixed in 8.1.4.1, 8.0.5.2
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f3w6-w445-fwh9 | RubyGems | activestorage | >=8.1.0.beta1 <8.1.4.1 | 8.1.4.1 |
| GHSA-f3w6-w445-fwh9 | RubyGems | activestorage | <8.0.5.2 | 8.0.5.2 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | rails | no fix listed | DEBIAN-CVE-2026-122006 |
| Ubuntu | 24.04:LTS, 26.04:LTS, 26.10 and 4 more | rails | no fix listed | UBUNTU-CVE-2026-122006 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.
Red Hat
Red Hat rates this Important.
A flaw in Active Storage's ImageMagick attachment analyzer allows a remote, unauthenticated attacker to upload a crafted file and execute unauthorized filesystem read and write operations due to the absence of a restrictive security policy during processing.
Configure an explicit, restrictive ImageMagick security policy (`policy.xml`) on the host to disable hazardous coders, or transition Active Storage attachment analysis and variant processing to use `vips` instead of `imagemagick`.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat 3scale API Management Platform 2 | 3scale-amp2/system-rhel8 | Will not fix | |
| Red Hat 3scale API Management Platform 2 | 3scale-amp2/system-rhel9 | Affected | |
| Red Hat 3scale API Management Platform 2 | 3scale-amp2/zync-rhel9 | Affected | |
| Red Hat Satellite 6 | rubygem-activestorage | Affected |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-122006.
GitHub PoC (unverified)
Repositories on GitHub named after this CVE. Nobody has checked them and they are not scanned: some hold a working proof of concept, some nothing useful, and some malware made to look like one. Read the code before you run any of it.
- charlie-goldenowl/cve-2026-122006-check 0 stars, Shell, created
Attack patterns (CAPEC)
- CAPEC-665 Exploitation of Thunderbolt Protection Flaws Likelihood: Low · Severity: Very High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.
References
- https://github.com/rails/rails/releases/tag/v8.0.5.2
- https://github.com/rails/rails/releases/tag/v8.1.4.1
- https://github.com/rails/rails/security/advisories/GHSA-f3w6-w445-fwh9
- https://github.com/alan-turing-institute/cyber-threat-observatory/blob/main/reports/2026-11-04/TIER_2_CVE-2026-122006.md
- https://github.com/digitalocean/droplet-1-clicks/pull/488
- https://github.com/rubysec/ruby-advisory-db/pull/1300