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io.netty:netty-codec-http2

netty

Netty versions prior to 4.1.136.Final and 4.2.16.Final have a vulnerability in the HTTP/2-to-HTTP/1.x translation layer where both the :authority pseudo-header and a literal Host header can coexist in a single HEADERS frame without proper validation. This leads to an HttpRequest object containing two conflicting Host headers, which could be manipulated by an attacker. The issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

The vulnerability in Netty's HTTP/2-to-HTTP/1.x translation layer (specifically in Http2StreamFrameToHttpObjectCodec and related components) allows an attacker to include both the :authority pseudo-header and a literal Host header in a single HEADERS frame without proper deduplication or validation. This results in an HttpRequest object with two conflicting Host headers. This flaw exists in Netty versions prior to 4.1.136.Final and 4.2.16.Final and has been addressed in those fixed versions.

Detailed information about Io.netty:netty codec http2: Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Ro

Io.netty:netty codec http2: Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass (CVE-2026-59900) - Live Threat Intelligence - Threat Radar | OffSeq.com

Prior to versions 4.1.136.Final and 4.2.16.Final, Netty's HTTP/2-to-HTTP/1.x translation layer (Http2StreamFrameToHttpObjectCodec and… (CVE-2026-59900)

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Threats Tagged 'ghsa-c69g-56f8-xwqj'

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