NetX Duo's WebSocket client resets the unmasking cursor to the first `NX_PACKET` each time it advances through a chained packet, while the loop's upper bound belongs to the current packet. With the standard contiguous packet-pool layout, a masked server frame split across two packets therefore drives the XOR loop through the first packet's unused payload area and on through the second packet's `NX_PACKET` control block. The four-byte WebSocket masking key controls the bytes written, so the corruption is attacker-chosen rather than incidental.
History

Wed, 30 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 30 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse netx Duo
Vendors & Products Eclipse
Eclipse netx Duo

Wed, 30 Sep 2026 00:30:00 +0000

Type Values Removed Values Added
Title NetX Duo WebSocket Client Buffer Overwrite via Masking Key

Tue, 29 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
Description NetX Duo's WebSocket client resets the unmasking cursor to the first `NX_PACKET` each time it advances through a chained packet, while the loop's upper bound belongs to the current packet. With the standard contiguous packet-pool layout, a masked server frame split across two packets therefore drives the XOR loop through the first packet's unused payload area and on through the second packet's `NX_PACKET` control block. The four-byte WebSocket masking key controls the bytes written, so the corruption is attacker-chosen rather than incidental.
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published: 2026-09-29T17:30:45.499Z

Updated: 2026-09-30T20:41:01.935Z

Reserved: 2026-09-29T16:22:00.376Z

Link: CVE-2026-102761

cve-icon Vulnrichment

Updated: 2026-09-30T20:40:57.457Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-29T18:17:13.450

Modified: 2026-09-30T21:17:05.550

Link: CVE-2026-102761

cve-icon Redhat

No data.