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TI-2026-26038 Aliases CVE-2026-33658GHSA-p9fm-f462-ggrg

Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests

Priority LOW 12CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

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 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. 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 0.00451 39th percentileScored 2026-11-07
Fix Fixed activestorage (rails): 8.1.2.1, 8.0.4.1, 7.2.3.1activestorage (RubyGems): 8.1.2.1, 8.0.4.1, 7.2.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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 to before 8.1.2.1; 8.0.0 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 to before 8.1.2.18.1.2.1Patch availableGHSA-p9fm-f462-ggrg
—activestorage (RubyGems)8.0.0 to before 8.0.4.18.0.4.1Patch availableGHSA-p9fm-f462-ggrg
—activestorage (RubyGems)before 7.2.3.17.2.3.1Patch availableGHSA-p9fm-f462-ggrg
  • activestorage VendorRails Affected 8.1.0 to before 8.1.2.1; 8.0.0 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 to before 8.1.2.1 Fixed in 8.1.2.1 Patch available GHSA-p9fm-f462-ggrg
  • activestorage (RubyGems) Vendor— Affected 8.0.0 to before 8.0.4.1 Fixed in 8.0.4.1 Patch available GHSA-p9fm-f462-ggrg
  • activestorage (RubyGems) Vendor— Affected before 7.2.3.1 Fixed in 7.2.3.1 Patch available GHSA-p9fm-f462-ggrg

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-p9fm-f462-ggrg activestorage (RubyGems) Fixed in 8.1.2.1 Advisory →
  • Fix · GHSA-p9fm-f462-ggrg activestorage (RubyGems) Fixed in 8.0.4.1 Advisory →
  • Fix · GHSA-p9fm-f462-ggrg activestorage (RubyGems) Fixed in 7.2.3.1 Advisory →

Vendor assessments

Red Hat

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

Not affected: 1 product
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33658
  2. 2026-10-03 Alias added: GHSA-p9fm-f462-ggrg

References

Advisory 3

Other 4

  • 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