Resource exhaustion in Rails Activestorage
CVE-2026-33658
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 reques…
EPSS: 0.000 (6.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Rails Activestorage — versions >= 8.1.0, < 8.1.2.1, >= 8.0.0, < 8.0.4.1, < 7.2.3.1
- Rubyonrails Rails
Weakness classification (CWE)
References
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg (x_refsource_CONFIRM, Vendor Advisory)
- https://github.com/rails/rails/releases/tag/v7.2.3.1 (Product, x_refsource_MISC, Release Notes)
- https://github.com/rails/rails/releases/tag/v8.0.4.1 (Product, x_refsource_MISC, Release Notes)
- https://github.com/rails/rails/releases/tag/v8.1.2.1 (Product, x_refsource_MISC, Release Notes)
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml (x_refsource_MISC, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-33658?
- CVE-2026-33658 is a medium-severity vulnerability in Rails Activestorage, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-03-26.
- How severe is CVE-2026-33658?
- Medium severity. CVSS v3 base score is 6.5 out of 10.