CVE-2026-33658 Details
Description
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.
A denial-of-service vulnerability has been identified in Rails Active Storage versions prior to 8.1.2.1, 8.0.4.1, and 7.2.3.1. The issue arises in the proxy controller, which fails to limit the number of byte ranges in an HTTP Range header. This oversight allows requests with thousands of small ranges to cause excessive CPU usage, disproportionately affecting server performance compared to normal file requests.
Users can upgrade to Active Storage versions 8.1.2.1, 8.0.4.1, or 7.2.3.1 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/rails/rails/releases/tag/v7.2.3.1 | [email protected] | ProductRelease Notes |
| https://github.com/rails/rails/releases/tag/v8.0.4.1 | [email protected] | ProductRelease Notes |
| https://github.com/rails/rails/releases/tag/v8.1.2.1 | [email protected] | ProductRelease Notes |
| https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg | [email protected] | Vendor Advisory |
| https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| rubyonrails rails | < 7.2.3.1 >= 8.0.0, < 8.0.4.1 >= 8.1.0, < 8.1.2.1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 30, 2026 | Initial Analysis | [email protected] |
| Mar 26, 2026 | New CVE Received | [email protected] |