CVE-2026-100665

Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass

Published: Sep 26, 2026Updated: Sep 26, 2026 Sources: CVE List NVDCWE-295

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-295

Affected Products

netty

oss-projectaka netty-incubator-codec-ohttp, io.netty:netty

nettyLibraryLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

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

github.com

https://github.com/netty/netty/commit/09e72c4fd8007277121ed48db63a124b112b96fe

github.com

https://github.com/netty/netty/commit/994e887ed9

github.com

and 1 more references View all →

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