Answer in brief
CVE-2026-116539 records a High severity (CVSS 8.2) vulnerability in Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO. 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 8.2. 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 a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process.
Quoted source text, attributed separately from HOL analysis.