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Rack::Request accepts invalid Host characters, enabling host allowlist bypass

šŸ—“ļøĀ 02 Apr 2026Ā 20:36:40Reported byĀ GitHub Advisory DatabaseTypeĀ 
github
Ā github
šŸ”—Ā github.comšŸ‘Ā 10Ā Views

Rack::Request parses Host permissively, enabling allowlist bypass with malicious Host values.

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13 May 2026 16:19Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.8 - 6.5
EPSS0.00192
SSVC
10