Out-of-bounds write in NetX Duo - CVE-2026-102761
Published: November 9, 2026
Vulnerability identifier: #VU162962
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102761
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to hijack control flow on devices using NetX Duo's WebSocket client.
The vulnerability exists due to an out-of-bounds write when the unmasking cursor restarts at the first packet while processing a masked frame spanning chained packets. An unauthenticated remote attacker can send such a frame from a connected hostile endpoint to corrupt packet metadata and redirect execution where the packet-pool and executable layouts permit.
Affected software
NetX Duo
How to mitigate CVE-2026-102761
Install security update from vendor's website.
NetX Duo - update to 6.5.2.202603