{"id":"CVE-2026-92853","title":"Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure","summary":"The TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned len…","severity":"high","cvss":8.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-125","CWE-191"],"vendor":"Eclipse Foundation","product":"NetX Duo","affected":["netx_duo <= 6.5.1.202602"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-20T17:02:10.102886Z"},"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T17:02:19.980Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-92853","references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-893m-9g4r-4992"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T16:10:53.331Z","slug":"CVE-2026-92853","body":"## Overview\n\nThe TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned length to `0xFFFFFFFF`, which makes the bounds check that follows vacuous and sends the parser reading past the session packet buffer.\n\n\n\nThe trigger is a four-byte handshake header and requires no cryptographic validity. It is reachable pre-authentication.\n\n## Affected\n\n- `netx_duo <= 6.5.1.202602`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}