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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Netty Subscribe
Netty-tcnative Subscribe
Netty-tcnative-boringssl-static Subscribe

No data.

No data.

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Vendors Products
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Netty-tcnative Subscribe
Netty-tcnative-boringssl-static Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/netty/netty-tcnative cve-icon cve-icon
https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L240 cve-icon cve-icon
https://github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b cve-icon cve-icon
https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final cve-icon cve-icon
https://github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489 cve-icon cve-icon
https://www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount cve-icon cve-icon
History

Mon, 26 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 26 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Netty
Netty netty-tcnative
Netty netty-tcnative-boringssl-static
Vendors & Products Netty
Netty netty-tcnative
Netty netty-tcnative-boringssl-static

Mon, 26 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Weaknesses CWE-682
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T19:48:35.492Z

Reserved: 2026-10-26T14:30:58.066Z

Link: CVE-2026-116541

cve-icon Vulnrichment

Updated: 2026-10-26T19:46:15.919Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T16:17:19.527

Modified: 2026-10-26T20:17:55.630

Link: CVE-2026-116541

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T18:49:51Z

Weaknesses