CVE-2026-116539GHSA-gf9q-9mg7-g5qh
Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO
netty netty-tcnativeFrameworks
CVSS
8.2HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 2
- netty-tcnativeaffected: all versions before 2.0.84.FinalCVE List
- netty-tcnative-boringssl-staticaffected: all versions before 2.0.84.FinalCVE List
References 6
- github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8Fixvia CVE List
- github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.FinalFixvia CVE List
- github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qhAdvisoryvia CVE List
- vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bioAdvisoryvia CVE List
- github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199Referencevia CVE List
- github.com/netty/netty-tcnativeReferencevia CVE List