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CVE-2026-33658

6.5 · MEDIUM

Active Storage allows users to attach cloud and local files in Rails applications.

Published Mar 26, 2026CWE-770EPSS 0.43%

Overview

CVE-2026-33658 is a medium-severity vulnerability. It was published on March 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rails/rails/releases/tag/v7.2.3.1GitHubgithub.com/rails/rails/releases/tag/v8.0.4.1GitHubgithub.com/rails/rails/releases/tag/v8.1.2.1GitHubgithub.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrgGitHubgithub.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33658?

CVE-2026-33658 is a medium-severity vulnerability. It was published on March 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-33658?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-33658?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33658?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33658 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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