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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👁 14 Views

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

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Detection
Refs
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cvelist
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CVE-2026-71554 h2: Duplicate Host header could facilitate request smuggling
6 Aug 202621:46
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debiancve
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CVE-2026-71554
6 Aug 202621:46
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euvd
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6 Aug 202622:18
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opensuse
OPENSUSE Linux
python313-h2-4.4.1-1.1 on GA media (moderate)
17 Aug 202600:00
opensuse
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Vulners
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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
14