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CVE-2026-116541— netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount

Quick assessment

Affected
netty netty-tcnative
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 2.0.84.Final 之前的 Netty netty-tcnative 版本中，tcn_write_to_bytebuffer 的 BIO 写入回调函数存在拒绝服务（DoS）漏洞，该函数会错误地高报已消耗的字节数。远程 TLS 1.3 对等端可借此触发已排队的握手后记录（如 NewSessionTicket 或 KeyUpdate），导致数据包批次被截断、连接失败，甚至终止 JVM 进程。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-116541

Vulnerability Information
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Vulnerability Title
netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty-tcnative 0 ~ 2.0.84.Final -
netty netty-tcnative-boringssl-static 0 ~ 2.0.84.Final -

II. Public POCs for CVE-2026-116541

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116541

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Vendor Advisories for CVE-2026-116541 (2)

Vendor Pages for CVE-2026-116541 (2)

Same Patch Batch · netty · 2026-10-26 · 4 CVEs total

CVE-2026-116539 5.9 MEDIUM Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO
CVE-2026-116540 5.9 MEDIUM netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback
CVE-2026-116542 5.3 MEDIUM Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding

IV. Related Vulnerabilities

Same product: netty-tcnative
Same vendor: netty
Same weakness: CWE-682