CVE-2026-33174Active Storage allows users to attach cloud and local files in Rails applications.
Updated under an hour ago ()
Does this affect you?
It affects rubyonrails rails. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-789
- 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/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5patch
- https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92apatch
- https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229bpatch
- https://github.com/rails/rails/releases/tag/v7.2.3.1release-notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1release-notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1release-notes
- https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvgvendor-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.