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CVE-2026-33658

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

Published: Mar 26, 2026Updated: Apr 30, 2026 Sources: CVE List NVD BDUCWE-770
6.5MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 64.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

rails
oss-projectaka rails-html-sanitizer, activestorage
activestorageLibrary
OSS Libraries / web-framework
rubyonrails
oss-project·USaka rails, ruby on rails, rubyonrails.org
rails
OSS Libraries
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Red Hat Inc.
commercial·USaka red hat
Red Hat SatelliteOn-prem
Operating Systems / linux-distro
Rails Core Team
oss-projectaka rails, actionview, rubyonrails, rack? no
Ruby on RailsLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
github.com
https://github.com/rails/rails/releases/tag/v7.2.3.1
github.com
https://github.com/rails/rails/releases/tag/v8.0.4.1
github.com
and 10 more references View all →

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