# CVE-2026-106465: Missing HelloVerifyRequest cookie validation in the NetX Secure DTLS server

Status: published. Published: 2026-10-14. Updated: 2026-11-04.

In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603, the NetX Secure DTLS server never compares the cookie a client returns with the one it issued, and treats any non-empty cookie as verified. A remote attacker can make the server send its full handshake flight, several kilobytes, to a forged source address, using it to reflect amplified traffic at a third party.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Eclipse Foundation / Eclipse ThreadX NetX Duo: ≥ 6.0; ≤ 6.5.2.202603 (affected, custom); 6.5.2.202603a (unaffected, custom). Source: CNA: eclipse

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L; source: CNA: eclipse

- CISA KEV: No listing in collected sources

- EPSS: 0.31% as of 2026-11-03; percentile 23.55%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-290, CWE-406

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-7c5f-gmpm-f655 (CNA: eclipse)

- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/379 (CNA: eclipse)

## Provenance

- CNA: eclipse: https://www.cve.org/CVERecord?id=CVE-2026-106465; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-106465; retrieved 2026-11-04; source updated Not reported

Revision: f6a3add3749323b9bf80d84887d674cdc1bb439ed51f95cc8bad005539e5a2e2

Canonical: https://y2.dev/cve/CVE-2026-106465

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