CVE-2026-116541
netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-682 |
| Vendor | netty |
| Product | netty-tcnative |
| Published | Oct 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
netty / netty-tcnative
0 < 2.0.84.Final
netty / netty-tcnative-boringssl-static
0 < 2.0.84.Final
References
github.com: https://github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489 github.com: https://github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b github.com: https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L240 github.com: https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final github.com: https://github.com/netty/netty-tcnative vulncheck.com: https://www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount
Credits
Yu Bao, PayPal Cyber Security Team