CVE-2026-33658

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.

References

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml

https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg

https://github.com/rails/rails/releases/tag/v8.1.2.1

https://github.com/rails/rails/releases/tag/v8.0.4.1

https://github.com/rails/rails/releases/tag/v7.2.3.1

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS