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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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-26 | Updated 2026-03-30 | Assigner GitHub_M




LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

>= 8.1.0, < 8.1.2.1
affected

>= 8.0.0, < 8.0.4.1
affected

< 7.2.3.1
affected

References

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

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

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

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

github.com/...b/master/gems/activestorage/CVE-2026-33658.yml

cve.org (CVE-2026-33658)

nvd.nist.gov (CVE-2026-33658)

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