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CVE-2026-33174

Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests

Published: Mar 23, 2026Updated: Mar 24, 2026 Sources: CVE List NVD BDUCWE-789
7.5HIGH
NVD MITRE
EPSS Score
0.6%
Top 55.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch 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, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. 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:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-789

Affected Products

railsrubyonrailsOSS Libraries
activestoragerails
Library
OSS Libraries / web-framework
Red Hat 3scale API Management PlatformRed Hat Inc.
On-prem
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Ruby on RailsRails Core Team
Library
OSS Libraries / web-framework
rubyonrailsoss-projectUSOSS Librariesaka rails, ruby on rails, rubyonrails.org
railsoss-projectOSS Librariesaka rails-html-sanitizer, activestorage
red hat inc.commercialUSOperating Systemsaka red hat
ооо «ред софт»commercialRUOperating Systemsaka red soft
rails core teamoss-projectOSS Librariesaka rubyonrails, rails, actionview, rack? no

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

References

https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5
github.com
https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a
github.com
https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b
github.com
and 14 more references View all →

Timeline

Published
Mar 23, 2026
Last Updated
Mar 24, 2026

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