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CVE-2026-33658

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

MEDIUM
6.5
CVSS Score
Published: March 26, 2026 at 09:03 PM UTC
Updated: June 17, 2026 at 10:37 AM UTC
2 products affected across 2 vendorsRailsActive Storage

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rails· Rubyonrails
95%
v < 7.2.3.18.0.0 ≤ v < 8.0.4.18.1.0 ≤ v < 8.1.2.1
Active Storage· Rails
60%
v < 7.2.3.1v < 8.0.4.1v < 8.1.2.1
Affected range stops below 7.2.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1.2.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/rails/rails/releases/tag/v7.2.3.1
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/rails/rails/releases/tag/v8.0.4.1
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/rails/rails/releases/tag/v8.1.2.1
x_refsource_MISCThird Party Advisory
Source: cverecord
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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