---
title: "CVE-2026-93475: NetX Secure - Buffer Overflow"
description: "NetX Secure contains a buffer overflow caused by accepting RSA public keys larger than NX_CRYPTO_MAX_RSA_MODULUS_SIZE during X.509 certificate verification, letting remote attackers trigger out-of-bounds writes pre-authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-93475/
---

# CVE-2026-93475 NetX Secure - Buffer Overflow

NetX Secure contains a buffer overflow caused by accepting RSA public keys larger than NX\_CRYPTO\_MAX\_RSA\_MODULUS\_SIZE during X.509 certificate verification, letting remote attackers trigger out-of-bounds writes pre-authentication.

CVSS base score 9.3 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93475)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the latest version with fixed RSA public key size validation.

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-2026-93475](https://nvd.nist.gov/vuln/detail/CVE-2026-93475)
- [https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-rcv5-vfff-25gh](https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-rcv5-vfff-25gh)

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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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