CVE-2026-116541 (CVSS 5.9)

Description

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.

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CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0049

Probability of exploitation

0.42%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-682 CWE-682

References

Other 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#L240 https://github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final https://github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489 https://www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-116541? +

CVE-2026-116541 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0049, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-116541? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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