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Medium severity5.3NVD Advisory· Published Jul 29, 2026· Updated Aug 6, 2026

CVE-2026-59900

CVE-2026-59900

Description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, 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. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-http2Maven
>= 4.2.0.Final, < 4.2.16.Final4.2.16.Final
io.netty:netty-codec-http2Maven
< 4.1.136.Final4.1.136.Final

Affected products

214

Patches

Vulnerability mechanics

References

4

News mentions

0

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