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TI-2026-25604 Aliases CVE-2026-33174GHSA-r46p-8f7g-vvvg

Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests

Priority LOW 36CWE-789Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-789.

Summary

Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00621 50th percentileScored 2026-11-07
Fix Partial activestorage (rails): 8.1.2.1, 8.0.4.1, 7.2.3.1activestorage (RubyGems): 8.1.2.1, 8.0.4.1, 7.2.3.1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Railsactivestorage8.1.0.beta1 to before 8.1.2.1; 8.0.0.beta1 to before 8.0.4.1; before 7.2.3.18.1.2.1, 8.0.4.1, 7.2.3.1Patch availableCNA
—activestorage (RubyGems)8.1.0.beta1 to before 8.1.2.18.1.2.1Patch availableGHSA-r46p-8f7g-vvvg
—activestorage (RubyGems)8.0.0.beta1 to before 8.0.4.18.0.4.1Patch availableGHSA-r46p-8f7g-vvvg
—activestorage (RubyGems)before 7.2.3.17.2.3.1Patch availableGHSA-r46p-8f7g-vvvg
  • activestorage VendorRails Affected 8.1.0.beta1 to before 8.1.2.1; 8.0.0.beta1 to before 8.0.4.1; before 7.2.3.1 Fixed in 8.1.2.1, 8.0.4.1, 7.2.3.1 Patch available CNA
  • activestorage (RubyGems) Vendor— Affected 8.1.0.beta1 to before 8.1.2.1 Fixed in 8.1.2.1 Patch available GHSA-r46p-8f7g-vvvg
  • activestorage (RubyGems) Vendor— Affected 8.0.0.beta1 to before 8.0.4.1 Fixed in 8.0.4.1 Patch available GHSA-r46p-8f7g-vvvg
  • activestorage (RubyGems) Vendor— Affected before 7.2.3.1 Fixed in 7.2.3.1 Patch available GHSA-r46p-8f7g-vvvg

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*before 7.2.3.1; 8.0.0 to before 8.0.4.1; 8.1.0 to before 8.1.2.1VulnerableRails
  • cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:* Versions before 7.2.3.1; 8.0.0 to before 8.0.4.1; 8.1.0 to before 8.1.2.1 Vulnerable ·Rails

Remediation

  • Fix · CNA activestorage (rails) Fixed in 8.1.2.1, 8.0.4.1, 7.2.3.1
  • Fix · GHSA-r46p-8f7g-vvvg activestorage (RubyGems) Fixed in 8.1.2.1 Advisory →
  • Fix · GHSA-r46p-8f7g-vvvg activestorage (RubyGems) Fixed in 8.0.4.1 Advisory →
  • Fix · GHSA-r46p-8f7g-vvvg activestorage (RubyGems) Fixed in 7.2.3.1 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix yet
Not affected: 2 products
  • Red Hat 3scale API Management Platform 2
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33174
  2. 2026-10-03 Alias added: GHSA-r46p-8f7g-vvvg
  3. 2026-10-08 EPSS moved to the below the 50th percentile
  4. 2026-11-07 EPSS moved to the 50th–90th percentile

References

Patch 3

Advisory 2

Other 5

  • TI-2014-00124 Directory traversal vulnerability in actionpack/lib/abstract_controller/base.rb in the… KEVCVSS 3.1HIGH 7.5
  • TI-2019-03828 Path traversal in Rails https://github.com/rails/rails KEVCVSS 3.1HIGH 7.5
  • TI-2016-00672 Directory traversal vulnerability in Action View in Ruby on Rails before 3.2.22.1, 4.0.x… KEVCVSS 3.1HIGH 7.5
  • TI-2019-03830 Command injection in Rails https://github.com/rails/rails CVSS 3.1CRITICAL 9.8
  • TI-2020-06581 Code injection in https://github.com/rails/rails CVSS 3.1HIGH 8.8
  • TI-2013-00091 active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before… CVSS 2.0HIGH 7.5
See all 117 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences