{"id":"CVE-2026-93475","revision":"e93281259c834e39aaf9431cc5174069","records":[{"revision":"e93281259c834e39aaf9431cc5174069","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93475","aliases":[],"title":"Out-of-bounds Write via an Unbounded RSA Modulus in NetX Secure X.509","description":"The X.509 parser in NetX Secure accepts an RSA public key of any size, but every signature-verification path decrypts into fixed-size buffers dimensioned for the `NX_CRYPTO_MAX_RSA_MODULUS_SIZE` default of 4096 bits. A certificate carrying a larger modulus drives an out-of-bounds write past a file-scope static during ordinary certificate-chain verification.\n\n\n\nIt is reachable pre-authentication. The issuer used for the crypto operation is looked up in the remote, peer-supplied store before the trusted store, so the attacker supplies the oversized key themselves as an intermediate in the chain they present. It triggers on a TLS or DTLS client verifying a malicious server's chain, and on a server performing client-certificate authentication.","state":0,"publishedAt":"2026-10-20T15:04:30.044+00:00","modifiedAt":"2026-10-20T17:02:52.372+00:00","affected":[{"ecosystem":"Vendor product","name":"NetX Duo","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Eclipse Foundation\",\n                    \"product\": \"Eclipse ThreadX - NetX Duo\",\n                    \"packageName\": \"NetX Duo\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"6.5.1.202602\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"6.5.2.202603\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 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","score":9.3,"severity":"CRITICAL"}],"references":["https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-rcv5-vfff-25gh"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93475","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93475","identifiers":["CVE-2026-93475"]},"retained":false,"historicalAffected":[]}],"coverage":[]}