Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/netty/netty-tcnative
- https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/
- https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70
- https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.8
- https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh
- https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-he
FAQ
What is CVE-2026-116539?
CVE-2026-116539 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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...
How severe is CVE-2026-116539?
CVE-2026-116539 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116539?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.