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Rack: Forwarded Header semicolon injection enables Host and Scheme spoofing

šŸ—“ļøĀ 02 Apr 2026Ā 20:31:52Reported byĀ GitHub Advisory DatabaseTypeĀ 
github
Ā github
šŸ”—Ā github.comšŸ‘Ā 11Ā Views

Rack::Utils.forwarded_values splits on semicolons, enabling host and scheme spoofing via quoted Forwarded values.

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13 May 2026 16:17Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.8 - 6.5
EPSS0.00179
SSVC
11