High severity7.5NVD Advisory· Published Mar 24, 2026· Updated Jun 17, 2026
CVE-2026-33174
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
12- osv-coords10 versionspkg:apk/chainguard/gitlab-rails-ce-18.10pkg:apk/chainguard/gitlab-rails-ce-18.8pkg:apk/chainguard/gitlab-rails-ce-18.9pkg:apk/chainguard/gitlab-rails-ce-fips-18.10pkg:apk/chainguard/gitlab-rails-ce-fips-18.9pkg: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
< 18.10.3-r1+ 9 more
- (no CPE)range: < 18.10.3-r1
- (no CPE)range: < 18.8.11-r4
- (no CPE)range: < 18.9.5-r0
- (no CPE)range: < 18.10.3-r0
- (no CPE)range: < 18.9.5-r0
- (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/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5nvdPatchWEB
- github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92anvdPatchWEB
- github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229bnvdPatchWEB
- github.com/advisories/GHSA-r46p-8f7g-vvvgghsaADVISORY
- github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvgnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-33174ghsaADVISORY
- github.com/rails/rails/releases/tag/v7.2.3.1nvdRelease NotesWEB
- github.com/rails/rails/releases/tag/v8.0.4.1nvdRelease NotesWEB
- github.com/rails/rails/releases/tag/v8.1.2.1nvdRelease NotesWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.ymlghsaWEB
News mentions
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