Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/netty/netty/commit/09e72c4fd8007277121ed48db63a124b112b96fe
- https://github.com/netty/netty/commit/994e887ed9
- https://github.com/netty/netty/security/advisories/GHSA-mj35-3qqm-q387
- https://www.vulncheck.com/advisories/netty-4.2.11-through-4.2.17-quic-hostname-v
- https://github.com/netty/netty/security/advisories/GHSA-mj35-3qqm-q387
FAQ
What is CVE-2026-100665?
CVE-2026-100665 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 BoringSSLCertifi...
How severe is CVE-2026-100665?
CVE-2026-100665 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100665?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.