Answer in brief
CVE-2026-116542 records a Medium severity (CVSS 6.9) vulnerability in Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding. The current sources do not mark it as known exploited. The current feed maps netty/io.netty:netty-tcnative (generic), netty/io.netty:netty-tcnative-boringssl-static (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps netty/io.netty:netty-tcnative (generic), netty/io.netty:netty-tcnative-boringssl-static (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| netty/io.netty:netty-tcnativegeneric | >=0 <2.0.84.Final | 2.0.84.Final |
| netty/io.netty:netty-tcnative-boringssl-staticgeneric | >=0 <2.0.84.Final | 2.0.84.Final |
Published upstream
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.