CVE-2026-116539

Description

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.

References

• https://github.com/netty/netty-tcnative
• https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199
• https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8
• https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final
• https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh