CVE-2026-102761GHSA-6xgx-v7gw-qjph
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 st
Eclipse Foundation NetX Duo
CVSS
9.3CriticalExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.25%Chance of exploitation activity in the next 30 days, higher than 15% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 2
- NetX Duoaffected: 6.2.0 through 6.5.1.202602CVE List
- NetX Duounaffected: 6.5.2.202603CVE List