CVE-2026-116539
Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the…
- Risk score
- 42/100
- CVSS
- 5.9 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 26 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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-o…
- Affected
- See advisory
- Fix
- Upgrade the product to 2.0.84 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.9 medium
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
- https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio
Original 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.
Last activity 26 Oct 2026. Patch Forecast updates every hour.