CVE-2026-33174

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

Severity Score

6.6

*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

Active Storage permite a los usuarios adjuntar archivos en la nube y locales en aplicaciones Rails. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, al servir archivos a través del modo de entrega de proxy de Active Storage, el controlador de proxy carga todo el rango de bytes solicitado en la memoria antes de enviarlo. Una solicitud con un encabezado Range grande o ilimitado (por ejemplo, 'bytes=0-') podría hacer que el servidor asigne memoria proporcional al tamaño del archivo, posiblemente resultando en una vulnerabilidad de DoS a través del agotamiento de la memoria. Las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1 contienen un parche.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

System

Vulnerable | Subsequent

Confidentiality

None

Integrity

None

Availability

High

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2026-03-17 CVE Reserved
2026-03-23 CVE Published
2026-03-24 CVE Updated
2026-03-29 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-789: Memory Allocation with Excessive Size Value

CAPEC

References (7)

URL	Tag	Source
https://github.com/rails/rails/releases/tag/v7.2.3.1	Release Notes
https://github.com/rails/rails/releases/tag/v8.0.4.1	Release Notes
https://github.com/rails/rails/releases/tag/v8.1.2.1	Release Notes

URL	Date	SRC

URL	Date	SRC
https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5	2026-03-24
https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a	2026-03-24
https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b	2026-03-24

URL	Date	SRC
https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg	2026-03-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Rubyonrails Search vendor "Rubyonrails"		Rails Search vendor "Rubyonrails" for product "Rails"				< 7.2.3.1 Search vendor "Rubyonrails" for product "Rails" and version " < 7.2.3.1"		-		Affected
Rubyonrails Search vendor "Rubyonrails"		Rails Search vendor "Rubyonrails" for product "Rails"				>= 8.0.0 < 8.0.4.1 Search vendor "Rubyonrails" for product "Rails" and version " >= 8.0.0 < 8.0.4.1"		-		Affected
Rubyonrails Search vendor "Rubyonrails"		Rails Search vendor "Rubyonrails" for product "Rails"				>= 8.1.0 < 8.1.2.1 Search vendor "Rubyonrails" for product "Rails" and version " >= 8.1.0 < 8.1.2.1"		-		Affected