CVE-2026-116541 PUBLISHED

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

Assigner: VulnCheck
Reserved: 26.10.2026 Published: 26.10.2026 Updated: 26.10.2026

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 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
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.9

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	netty
Product	netty-tcnative
Versions	Default: unaffected affected from 0 to 2.0.84.Final (excl.)

Vendor	netty
Product	netty-tcnative-boringssl-static
Versions	Default: unaffected affected from 0 to 2.0.84.Final (excl.)

CVE-2026-116541 PUBLISHED

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

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Product Status

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References

Problem Types