{"id":"CVE-2026-102761","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102761","generatedAt":"2026-10-28T00:57:18.103Z","title":"The four-byte WebSocket masking key controls the bytes written, so the corruption is attacker-chosen rather than incidental.","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.\n\n\n\nThe four-byte WebSocket masking key controls the bytes written, so the corruption is attacker-chosen rather than incidental.","published":"2026-09-29T18:17:13.000Z","lastModified":"2026-09-30T21:17:06.000Z","status":"Awaiting Analysis","sourceIdentifier":"emo@eclipse.org","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-787"],"affected":[],"epss":{"score":0.00253,"percentile":0.16608,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.00253,"percentile":0.15142}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T18:17:13.000Z","detail":{"score":"9.3","severity":"CRITICAL","publishedAt":"2026-09-29T18:17:13.450Z"},"summary":"New CVE, critical severity (CVSS 9.3)."}],"references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-6xgx-v7gw-qjph","source":"emo@eclipse.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102761","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}