Vulnerability in Netty Netty-Tcnative
CVE-2026-116541
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489 (vendor-advisory)
- github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b (patch)
- github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl… (technical-description)
- github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final (release-notes)
- github.com/netty/netty-tcnative (product)
- www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-servi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116541?
- CVE-2026-116541 is a medium-severity vulnerability in Netty Netty-Tcnative, classified under Incorrect Calculation. CVSS score: 5.9/10. Published 2026-10-26.
- How severe is CVE-2026-116541?
- Medium severity. CVSS v3 base score is 5.9 out of 10.