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GeekWala

CVE-2026-33658

LOW

Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests

Published March 25, 2026Updated May 6, 2026Source: osv

Summary

### Impact 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. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone researcher [thwin_htet](https://hackerone.com/thwin_htet).

Remediation

Upgrade to the fixed version using your package manager.

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

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

Affected Packages (3)

PackageEcosystemAffectedFixed In
activestorage
rubygems
8.0.0, 8.0.0.1, 8.0.1, 8.0.2 (+3 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
activestorage
rubygems
8.1.0, 8.1.1, 8.1.28.1.2.1

Vulnerability Classification

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

  • CWE-770
    Allocation of Resources Without LimitsMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.5 score means for each attack dimension.

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2026-33658?
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests This vulnerability has been assigned a severity rating of LOW (CVSS score: 6.5/10).
How do I check if my project is affected by CVE-2026-33658?
CVE-2026-33658 affects activestorage. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33658 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.5

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-p9fm-f462-ggrg

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