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.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
High
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
E
Unchanged
Affected products
- rails / activestorage>= 8.1.0, < 8.1.2.1 – >= 8.1.0, < 8.1.2.1
- rails / activestorage>= 8.0.0, < 8.0.4.1 – >= 8.0.0, < 8.0.4.1
- rails / activestorage< 7.2.3.1 – < 7.2.3.1
References
- VENDOR_ADVISORYhttps://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
- PATCHhttps://github.com/rails/rails/releases/tag/v7.2.3.1
- PATCHhttps://github.com/rails/rails/releases/tag/v8.0.4.1
- PATCHhttps://github.com/rails/rails/releases/tag/v8.1.2.1
- VENDOR_ADVISORYhttps://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml
Updated 35m ago · 8 sources