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CVE-2026-33174

MEDIUM

Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests

Published March 23, 2026Updated May 13, 2026Source: osv

Summary

### Impact When serving files through Active Storage's `Blobs::ProxyController`, the 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. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update activestorage to 8.1.2.1 or later
gem install activestorage -v 8.1.2.1
Bundler
Update activestorage to 8.0.4.1 or later
gem install activestorage -v 8.0.4.1
Bundler
Update activestorage to 7.2.3.1 or later
gem install activestorage -v 7.2.3.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

PackageEcosystemAffectedFixed In
activestorage
rubygems
8.1.0, 8.1.0.beta1, 8.1.0.rc1, 8.1.1 (+1 more)8.1.2.1
activestorage
rubygems
8.0.0, 8.0.0.1, 8.0.0.beta1, 8.0.0.rc1 (+6 more)8.0.4.1
activestorage
rubygems
0.1, 5.2.0, 5.2.0.beta1, 5.2.0.beta2 (+157 more)7.2.3.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

References

Frequently Asked Questions

What is CVE-2026-33174?
Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-33174?
CVE-2026-33174 affects activestorage. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33174 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-r46p-8f7g-vvvg

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