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CVE-2026-33174
Ruby vulnerability analysis and mitigation

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, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. bytes=0-) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.


SourceNVD

Related Ruby vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-34060HIGH7.1
  • RubyRuby
  • ruby-lsp
NoYesMar 31, 2026
CVE-2026-33635MEDIUM4.3
  • RubyRuby
  • icalendar
NoYesMar 26, 2026
GHSA-2j22-pr5w-6gq8LOW2.3
  • RubyRuby
  • loofah
NoYesMar 26, 2026
CVE-2026-33658LOW2.3
  • RubyRuby
  • activestorage
NoYesMar 26, 2026
GHSA-53p3-c7vp-4mccLOW2.1
  • JavaScriptJavaScript
  • action_text-trix
NoYesMar 29, 2026

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