CVE-2026-33658 PUBLISHED

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

Assigner: GitHub_M
Reserved: 23.03.2026 Published: 26.03.2026 Updated: 26.03.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
CVSS Score: 2.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	rails
Product	activestorage
Versions	Version >= 8.1.0, < 8.1.2.1 is affected Version >= 8.0.0, < 8.0.4.1 is affected Version < 7.2.3.1 is affected

References

Problem Types

CWE-770: Allocation of Resources Without Limits or Throttling CWE