---
title: "CVE-2026-92843: NetX Secure - Out of Bounds Read"
description: "NetX Secure contains an unsigned-integer underflow caused by missing bounds check in TLS 1.3 Certificate-message parser, letting malicious TLS 1.3 servers trigger heap out-of-bounds read pre-authentication during handshake."
url: https://panop.io/threat-heartbeat/CVE-2026-92843/
---

# CVE-2026-92843 NetX Secure - Out of Bounds Read

NetX Secure contains an unsigned-integer underflow caused by missing bounds check in TLS 1.3 Certificate-message parser, letting malicious TLS 1.3 servers trigger heap out-of-bounds read pre-authentication during handshake.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92843)

## Details

Type

Out of Bounds Read

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to the latest version of NetX Secure containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-92843](https://nvd.nist.gov/vuln/detail/CVE-2026-92843)
- [https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4m85-f9qh-q3jv](https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4m85-f9qh-q3jv)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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