{"id":"CVE-2026-102761","state":"PUBLISHED","title":"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","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.","publishedAt":"2026-09-29T17:30:45.499Z","updatedAt":"2026-09-30T20:41:01.935Z","severity":{"score":9.3,"label":"Critical","version":"4.0","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","source":"eclipse"},"assigner":"eclipse","products":["Eclipse Foundation NetX Duo"],"affected":[{"vendor":"Eclipse Foundation","product":"NetX Duo","packageName":"NetX Duo","defaultStatus":"unaffected","versions":[{"version":"6.2.0","status":"affected","lessThanOrEqual":"6.5.1.202602","versionType":"semver"},{"version":"6.5.2.202603","status":"unaffected"}]}],"references":["https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-6xgx-v7gw-qjph"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/102xxx/CVE-2026-102761.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-102761","state":"PUBLISHED","datePublished":"2026-09-29T17:30:45.499Z","dateUpdated":"2026-09-30T20:41:01.935Z","assignerShortName":"eclipse","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateReserved":"2026-09-29T16:22:00.376Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Eclipse Foundation","product":"NetX Duo","packageName":"NetX Duo","defaultStatus":"unaffected","versions":[{"version":"6.2.0","status":"affected","lessThanOrEqual":"6.5.1.202602","versionType":"semver"},{"version":"6.5.2.202603","status":"unaffected"}]}],"references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-6xgx-v7gw-qjph"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"eclipse","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateUpdated":"2026-09-29T17:30:45.499Z"},"credits":[{"lang":"en","value":"leginwos","type":"reporter"},{"lang":"en","value":"adawn0106","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T20:40:47.914262Z","id":"CVE-2026-102761","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-30T20:41:01.935Z"}}]}}}