CVE-2026-33174

HIGH
2026-03-23 https://github.com/rails/rails
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 23, 2026 - 21:15 vuln.today
Patch Released
Mar 23, 2026 - 21:15 nvd
Patch available
CVE Published
Mar 23, 2026 - 21:08 nvd
HIGH 7.5

Tags

Information Disclosure

Description

### Impact When serving files through Active Storage's `Blobs::ProxyController`, the 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. ### Releases The fixed releases are available at the normal locations.

Analysis

Rails Active Storage's Blobs::ProxyController loads entire requested byte ranges into memory before transmission, allowing remote unauthenticated attackers to exhaust server memory and cause denial of service by sending requests with large or unbounded Range headers. This vulnerability affects systems using Active Storage for file serving and requires no user interaction or authentication to exploit. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2026-33174 vulnerability details – vuln.today
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