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CVE-2026-116539— Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO

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.

Netty 项目中的 netty-tcnative 组件在 2.0.84.Final 版本之前存在堆缓冲区溢出漏洞。该漏洞源于 BIO 回调函数未能正确封装非应用环形缓冲区的写入索引。远程 TLS 对等端可通过驱动握手、重协商或握手后消息写入该缓冲区，从而触发越界操作，导致 JVM 进程崩溃。

CVSS 5.9 · Medium Updated Oct 26, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO

Source: CVE Program / CVE List V5

Vulnerability Description

Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes 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

跨界内存写

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-2026-116539

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-116539

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Patches & Fixes for CVE-2026-116539 (1)

🔗 Correctly handle wrap around in ring buffer used internally to buffer… · netty/netty-tcnative@92dd66f · GitHub patch

Vendor Advisories for CVE-2026-116539 (2)

Vendor Pages for CVE-2026-116539 (2)

https://www.cve.org/CVERecord?id=CVE-2026-116539

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

CVE-2026-116541	5.9 MEDIUM	netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
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-787