EUVD-2026-16426CVSS 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Description
### Impact 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. ### Releases The fixed releases are available at the normal locations.
Analysis
Rails Active Storage's proxy controller fails to limit the number of byte ranges accepted in HTTP Range headers, allowing attackers to craft requests with thousands of small ranges that consume disproportionate CPU resources compared to legitimate file requests. This denial-of-service vulnerability affects Ruby on Rails applications using the ActiveStorage library (pkg:rubygems/activestorage). …
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Remediation
During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.
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