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.
Published: 2026-09-29
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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History

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'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

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

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

Link: CVE-2026-102761

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-102761

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses