Bug 2541820 (CVE-2026-100665) - CVE-2026-100665 io.netty/netty-codec-classes-quic: io.netty/netty-codec-quic: netty: Hostname verification bypass via incomplete QUIC certificate validation
Summary: CVE-2026-100665 io.netty/netty-codec-classes-quic: io.netty/netty-codec-quic:...
Keywords:
Status: NEW
Alias: CVE-2026-100665
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-26 13:32 UTC by OSIDB Bzimport
Modified: 2026-09-27 19:05 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-26 13:32:45 UTC 
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.
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