CVE-2026-93475: Out-Of-Bounds Write Flaw in Eclipse ThreadX - NetX Duo Scores 9.3 on CVSS

Eclipse ThreadX - NetX Duo is affected by CVE-2026-93475, a out-of-bounds write that the National Vulnerability Database rates 9.3 out of 10.

At a glance

CVE

CVE-2026-93475

Product

Eclipse ThreadX - NetX Duo

CVSS

9.3 Critical

Weakness

out-of-bounds write

Exploited

No known exploitation

What is the vulnerability?

The NVD entry states: The X.509 parser in NetX Secure accepts an RSA public key of any size, but every signature-verification path decrypts into fixed-size buffers dimensioned for the `NX_CRYPTO_MAX_RSA_MODULUS_SIZE` default of 4096 bits. A certificate carrying a larger modulus drives an out-of-bounds write past a file-scope static during ordinary certificate-chain verification. It is reachable pre-authentication. The issuer used for the crypto operation is looked up in the remote, peer-supplied store before the trusted store, so the attacker supplies the oversized key themselves as an intermediate in the chain they present. It triggers on a TLS or DTLS client verifying a malicious server's chain, and on a server performing client-certificate authentication.

Affected versions

Is it being exploited?

There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.

What should you do?

• Identify whether the affected product and versions run in your environment.
• Apply the vendor update listed in the advisory as soon as it is available.
• Limit network exposure of the affected service until it is patched.
• Monitor the vendor advisory for updated guidance or exploitation reports.

What to do and how to stay safe: CVE-2026-93475

• Vulnerability severity scores ignore your specific architecture and context.
• Exploitability depends on network exposure and user behavior, not just code flaws.
• Prioritization requires continuous asset inventory and threat intelligence alignment.

Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.

Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger

General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is CVE-2026-93475?

CVE-2026-93475 is a out-of-bounds write vulnerability in Eclipse ThreadX - NetX Duo.

How severe is CVE-2026-93475?

It has a CVSS score of 9.3 Critical.

Is CVE-2026-93475 being exploited?

There is no public confirmation of exploitation at the time of publication.