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GHSA-G2PF-XV49-M2H5 Rack::Request accepts invalid Host characters, enabling host allowlist bypass

šŸ—“ļøĀ 02 Apr 2026Ā 20:36:40Reported byĀ GoogleTypeĀ 
osv
Ā osv
šŸ”—Ā osv.devšŸ‘Ā 2Ā Views

Rack::Request parses Host with invalid chars, bypassing allowlists and enabling header poisoning.

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13 May 2026 16:39Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.8
EPSS0.00192
2