GHSA-c69g-56f8-xwqj

Dashboard / Vulnerabilities / GHSA-c69g-56f8-xwqj

GHSA-c69g-56f8-xwqj

Summary: Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass

Details: 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.

References: https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj, https://github.com/netty/netty, https://github.com/netty/netty/releases/tag/netty-4.1.136.Final, https://github.com/netty/netty/releases/tag/netty-4.2.16.Final