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0 python-hyper h2 versions up to and including 4.4.0 have a vulnerability where HTTP/2 request header blocks containing multiple Host headers are accepted and forwarded to the application. When the consumer downgrades HTTP/2 to HTTP/1.1, this results in two Host header lines in the HTTP/1.1 request, enabling HTTP request smuggling. This issue is resolved in version 4.4.1. Join the discussion | CVE Database V5 | 08/06/2026, 21:46:43 UTC Added: 08/06/2026, 22:13:37 UTC |
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