CVE-2026-102759CWE-354

CVE-2026-102759

published September 29, 2026

CVSS
6.3
EPSS
0%
Percentile
4.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
6.3 · NONE
CVSS v4.0
6.3 · CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00156 · 4.4th percentile
Weakness
CWE-354 · Improper Validation of Integrity Check Value
Published
2026-09-29T22:17Z
References (1)
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-m7j3-vh25-xc8p · [email protected]
EPSS history
Timeline
  • 01 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 29 SEP 17:28Z
    NetX Secure TLS accepts an empty application-data record without verifying its message authentication code
    cvelistv5