CVE-2026-100659
Description
Netty's HTTP/3 codec (io.netty:netty-codec-http3) in versions 4.2.0.Final through 4.2.17.Final does not enforce the RFC 9114 requirement that the :authority pseudo-header field and a literal host header field, when both present, carry the same value. A remote unauthenticated peer can send a single HEADERS frame containing both fields with differing, attacker-controlled values; the request is accepted and delivered to the application with two conflicting authorities, allowing routing, virtual-host, and access-control decisions to be bypassed when different components in the request path consult different fields. This issue is fixed in 4.2.18.Final.
How to fix
- netty netty4.2.18.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| netty netty | 4.2.0.Final ≤ v < 4.2.18.Final | 4.2.18.Final |
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