CVE-2026-100665
Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-295 |
| Vendor | netty |
| Product | netty |
| Published | Sep 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
netty / netty
4.2.11.Final < 4.2.18.Final
References
github.com: 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 vulncheck.com: https://www.vulncheck.com/advisories/netty-4.2.11-through-4.2.17-quic-hostname-verification-bypass
Credits
🔍 rexpository