CVE-2026-102759 NetX Secure TLS accepts an empty application-data record without verifying its message authentication code.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-102759?
CVE-2026-102759 is a medium-severity vulnerability in Eclipse Foundation NetX Duo, published on 29 Sep 2026.
Official description
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.
Weakness: CWE-354
Which versions are affected by CVE-2026-102759?
How do I fix CVE-2026-102759?
No fix has been published for CVE-2026-102759 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-102759 being exploited?
There is no known exploitation of CVE-2026-102759 in the wild and no public exploit code.
Sources
Also known as GHSA-m7j3-vh25-xc8p, GHSA-q2vr-5v2w-fjr2.