CVE-2026-33658 LOW

CVE-2026-33658: Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests

Vendor Rails
Product activestorage
Weakness CWE-770 · Uncontrolled resource consumption
Published March 26, 2026
Last update March 30, 2026
View on NVD All CVEs

CVSS base score

2.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

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.

Key dates

Disclosure timeline

March 26, 2026 CVE published
March 30, 2026 Record updated