CVE-2026-100665

High

Description

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNetty

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-295CWE-295

How to fix

Update

netty netty4.2.18.Final or later

Patches

Vendor advisories

github.com/netty/netty/security/advisories/GHSA-mj35-3qqm-q387

Affected products

Product	Affected versions	Fixed in
netty netty	4.2.11.Final ≤ v < 4.2.18.Final	4.2.18.Final

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