VulnerabilityAnalyzed
CVE-2026-33658
Active Storage allows users to attach cloud and local files in Rails applications.
LOW 2.3EPSS 0.43%
Does this matter?
Lower severity and a low EPSS score (0.43%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 2.3 LOWCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.43% probability · 37th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- rubyonrails/rails
- Source
- security-advisories@github.com
References
- https://github.com/rails/rails/releases/tag/v7.2.3.1Product, Release Notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1Product, Release Notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1Product, Release Notes
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrgVendor Advisory
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.ymlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.