CVE-2026-75595

CVE-2026-75595 · Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext

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Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause an IndexOutOfBoundsException and invoke select(ctx, null). This selects the default SslContext instead of the SNI-specific context. In deployments where per-SNI clientAuth=REQUIRE is the sole mutual TLS gate, the default SslContext uses clientAuth=NONE or clientAuth=OPTIONAL, and no application-layer certificate verification exists, an unauthenticated remote attacker can bypass the protected route's mutual TLS requirement. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

CVSS 9.1 · Критический · EPSS 0,3%

Опубликовано

2026-08-19T21:00:27.627Z

Обновлено

2026-08-20T14:06:16.963Z

Стек: system

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