| Package | Affected versions | Patched versions |
|---|---|---|
| io.netty:netty-codec-http2 | ≥ 4.2.0.Final, < 4.2.16.Final< 4.1.136.Final | 4.2.16.Final4.1.136.Final |
| netty | ≥ 4.2.0, < 4.2.16< 4.1.136 | 4.2.164.1.136 |
Netty's HTTP/2-to-HTTP/1.x translation layer (Http2StreamFrameToHttpObjectCodec and InboundHttp2ToHttpAdapter) fails to deduplicate or validate Host headers when an HTTP/2 client supplies both the :authority pseudo-header and a literal host header in a single HEADERS frame. The translator maps :authority to Host and separately copies the literal host header, producing an HttpRequest object containing two Host headers with attacker-controlled differing values.
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