Vulnerability Description
Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send overlong encodings like 0xC0 0x80 in the ClientHello server_name to confuse SNI-based certificate selection, access decisions, and logging.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/netty/netty-tcnative
- https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/
- https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0
- https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.8
- https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf
- https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sn
- https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf
FAQ
What is CVE-2026-116542?
CVE-2026-116542 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send...
How severe is CVE-2026-116542?
CVE-2026-116542 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116542?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.