Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext

Date Sep 8, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Maven · io.netty:netty-handler

CVE CVE-2026-75595

Critical vendor advisory CVE-2026-75595

Summary

Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext

Why it matters

GitHub has published a reviewed security advisory for io.netty:netty-handler. Prioritize it with other application dependency updates, especially because EPSS places it in the 24% percentile.

Operator check

Check whether io.netty:netty-handler is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.1. EPSS probability: 0.3%; percentile: 24%.

Sources

GitHub Advisory GHSA-c4c3-7fpv-j4q5 NVD — CVE-2026-75595 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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