# CVE-2026-106464: Eclipse ThreadX NetX Duo X.509 signature parsing out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-106464-nx-secure-x509-parse-signature-data-computes-the-certificate  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-106464 · Severity: info · Published 2026-10-14

NetX Duo is a real-time operating system networking library used in embedded systems. When parsing X.509 certificates during a TLS handshake, a malformed certificate with an empty signature field causes the parser to miscalculate the signature length, resulting in an out-of-bounds memory read. An attacker can send a crafted certificate to trigger this vulnerability and potentially crash the system or read sensitive memory.

Technologies: [Eclipse ThreadX NetX Duo](https://junglewise.ai/threats/technologies/eclipse-threadx-netx-duo). Vendors: [Eclipse ThreadX](https://junglewise.ai/threats/vendors/eclipse-threadx).

## Quick answers

**Is CVE-2026-106464 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106464 being exploited in the wild.

**How severe is CVE-2026-106464?** Informational severity, published 14 October 2026.

**Which products and versions are affected?** Eclipse ThreadX NetX Duo <= 6.5.2.202603.

**Is there a fix for CVE-2026-106464?** Yes: fixed in NetX Duo 6.5.2.202603a. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106464 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-106464?** Check whether you run Eclipse ThreadX NetX Duo at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in NetX Duo 6.5.2.202603a

## Technical details

The `_nx_secure_x509_parse_signature_data` function subtracts one from the ASN.1 BIT STRING length without first validating that the length is non-zero, causing an unsigned 32-bit integer underflow. An empty BIT STRING (length 0) wraps to 0xFFFFFFFF, and the signature pointer moves one byte past the certificate buffer. During ECDSA verification, the unbounded length bypasses downstream bounds checks that walk the signature's DER structure, leading to reads far beyond the allocated buffer.

## Affected products

- Eclipse ThreadX NetX Duo <= 6.5.2.202603

## Timeline

- 2026-10-13: disclosed
- 2026-10-13: patched: Fixed in 6.5.2.202603a hotfix release

## References

- [https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-ww3q-3444-q488](https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-ww3q-3444-q488)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work_items/368](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/368)

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