Moderate severityNVD Advisory· Published Mar 23, 2026· Updated Mar 24, 2026
Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
CVE-2026-33174
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, 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
activestorageRubyGems | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
activestorageRubyGems | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
activestorageRubyGems | < 7.2.3.1 | 7.2.3.1 |
Affected products
6- osv-coords5 versionspkg:apk/chainguard/ruby3.2-rails-8.1pkg:apk/chainguard/ruby3.4-rails-8.0pkg:apk/wolfi/ruby3.2-rails-8.1pkg:apk/wolfi/ruby3.4-rails-8.0pkg:gem/activestorage
< 8.1.3-r0+ 4 more
- (no CPE)range: < 8.1.3-r0
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: < 8.1.3-r0
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: >= 8.1.0.beta1, < 8.1.2.1
- Range: >= 8.1.0.beta1, < 8.1.2.1
Patches
Vulnerability mechanics
References
10- github.com/advisories/GHSA-r46p-8f7g-vvvgghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33174ghsaADVISORY
- github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5ghsax_refsource_MISCWEB
- github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92aghsax_refsource_MISCWEB
- github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229bghsax_refsource_MISCWEB
- github.com/rails/rails/releases/tag/v7.2.3.1ghsax_refsource_MISCWEB
- github.com/rails/rails/releases/tag/v8.0.4.1ghsax_refsource_MISCWEB
- github.com/rails/rails/releases/tag/v8.1.2.1ghsax_refsource_MISCWEB
- github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvgghsax_refsource_CONFIRMWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.ymlghsaWEB
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