CVE-2026-116542

MEDIUM 5.3CVE-2026-116542 · Published 26/10/2026 · updated 31/10/2026

In short

CVE-2026-116542 is a MEDIUM (CVSS 5.3) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.21%, higher than 11.1% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

netty/netty-tcnative
netty/netty-tcnative
netty/netty-tcnative commit a879c85
netty/netty-tcnative release netty-tcnative-parent-2.0.84.Final
netty/netty-tcnative security advisory
vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding

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