# CVE-2026-33658: Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests

Source: https://junglewise.ai/threats/cve-2026-33658-rails-active-storage-has-a-possible-dos-vulnerability-in-proxy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-25  
License: CC BY 4.0 with a link back

CVE-2026-33658 · Severity: low · CVSS 3.1 · Published 2026-03-25

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

Technologies: [activestorage (RubyGems)](https://junglewise.ai/threats/technologies/activestorage). Vendors: [RubyGems](https://junglewise.ai/threats/vendors/rubygems).

## Quick answers

**Is CVE-2026-33658 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33658 being exploited in the wild.

**How severe is CVE-2026-33658?** Low severity, with a CVSS score of 3.1, published 25 March 2026.

**Which products and versions are affected?** activestorage (RubyGems) ECOSYSTEM:introduced=8.1.0,fixed=8.1.2.1.

**Is there a fix for CVE-2026-33658?** Yes. activestorage (RubyGems): upgrade to 8.1.2.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-33658?** Check whether you run activestorage (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- activestorage (RubyGems): upgrade to 8.1.2.1 or later

  ```sh
  bundle update activestorage
  ```


## Affected products

- activestorage (RubyGems) ECOSYSTEM:introduced=8.1.0,fixed=8.1.2.1

## Identifiers

- CVE-2026-33658
- GHSA-p9fm-f462-ggrg

## Related threats

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- [Ruby on Rails Active Storage GCS signature bypass](https://junglewise.ai/threats/cve-2026-126084-active-storage-makes-it-simple-to-upload-and-reference-files-in)
- [Rails Active Storage persistent DoS via NUL byte filename](https://junglewise.ai/threats/cve-2026-126074-active-storage-makes-it-simple-to-upload-and-reference-files-in)