CVE-2026-33658Active Storage allows users to attach cloud and local files in Rails applications.
Updated under an hour ago ()
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It affects rubyonrails rails. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rubyonrails rails rubyonrails:rails | before 7.2.3.1; from 8.0.0 before 8.0.4.1; from 8.1.0 before 8.1.2.1 | NVD |
References
- https://github.com/rails/rails/releases/tag/v7.2.3.1product, release-notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1product, release-notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1product, release-notes
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrgvendor-advisory
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.ymlthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.