CVE-2026-33658
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 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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 2:7.2.3.1+dfsg-1 |
| forky | Fixed | 2:7.2.3.1+dfsg-1 |
| bullseye | Affected | — |
| bookworm | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | activestorage | <~> 7.2.3, >= 7.2.3.1 | ~> 7.2.3, >= 7.2.3.1 |
| RubyGems | activestorage | >=8.1.0,<8.1.2.1 | 8.1.2.1 |
| RubyGems | activestorage | >=8.0.0,<8.0.4.1 | 8.0.4.1 |
| RubyGems | activestorage | <7.2.3.1 | 7.2.3.1 |
| RUBYGEMS | activestorage | < 7.2.3.1 | 7.2.3.1 |
| RUBYGEMS | activestorage | >= 8.0.0, < 8.0.4.1 | 8.0.4.1 |
| RUBYGEMS | activestorage | >= 8.1.0, < 8.1.2.1 | 8.1.2.1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| rubyonrails | rails | {"endExcluding":"7.2.3.1"} | 7.2.3.1 |
References
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
- https://github.com/rails/rails/releases/tag/v7.2.3.1
- https://github.com/rails/rails/releases/tag/v8.0.4.1
- https://github.com/rails/rails/releases/tag/v8.1.2.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml
- https://nvd.nist.gov/vuln/detail/CVE-2026-33658
- https://github.com/rails/rails
- https://security-tracker.debian.org/tracker/CVE-2026-33658
- https://github.com/advisories/GHSA-p9fm-f462-ggrg
CWEs
CWE-770
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.