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CVE-2026-106465

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-290

Description

The NetX Secure DTLS server sends a HelloVerifyRequest carrying a freshly generated cookie, but never checks the cookie a client returns. The ClientHello parser copies the client's cookie bytes over the value the server issued, and the server then decides whether the client has been verified from the cookie's length alone. A peer that puts any single cookie byte in its first ClientHello skips the verification exchange entirely, so the server has no return-routability check and completes handshakes for forged source addresses.

Affected products

• Eclipse Foundation NetX Duo: through 6.5.2.202603

References

• https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-7c5f-gmpm-f655
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/379

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