CVE-2026-116541highCWE-682

CVE-2026-116541: high-severity vulnerability in netty-tcnative

netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.2epss 0.5%
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
netty · netty-tcnativenetty · netty-tcnative-boringssl-static
Related CVEs — netty-tcnative

In the same product, most dangerous first.

CVE-2026-116540HIGHnetty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket CallbackEPSS 0.5%CVE-2026-116539HIGHNetty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIOEPSS 0.4%CVE-2026-116542MEDIUMNetty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 DecodingEPSS 0.2%