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h2: Duplicate Host header could facilitate request smuggling

🗓️ 06 Aug 2026 21:53:41Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 19 Views

Duplicate Host headers in HTTP/2 downgrade enable request smuggling; fixed in v4.4.1.

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h2databaseh2Range4.4.0pip

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06 Aug 2026 21:53Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.3
EPSS0.00443
SSVC
19