CVE-2026-102759: Eclipse Foundation Netx Duo

Medium severity, CVSS 6.3. EPSS: 0.2% chance of exploitation in the next 30 days.

NetX Secure TLS accepts an empty application-data record without verifying its message authentication code. In `_nx_secure_verify_mac`, a decrypted application record whose length equals the negotiated MAC size is treated as valid and returns success after advancing the receive sequence number. The received MAC is never generated or compared. Empty TLS application-data records are legal, and are commonly emitted by TLS 1.0 implementations as a BEAST mitigation.

Affected products

• Eclipse Foundation Netx Duo: from 6.2.0, up to and including 6.5.1.202602

Published 2026-09-29. Last modified 2026-09-29.