{"id":"CVE-2026-93475","summary":"Out-of-bounds Write via an Unbounded RSA Modulus in NetX Secure X.509","details":"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.","aliases":["GHSA-rcv5-vfff-25gh"],"modified":"2026-10-21T03:00:16.937798801Z","published":"2026-10-20T15:04:30.044Z","database_specific":{"cwe_ids":["CWE-1284","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93475.json","cna_assigner":"eclipse"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93475.json"},{"type":"ADVISORY","url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-rcv5-vfff-25gh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93475"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-threadx/netxduo","events":[{"introduced":"0"},{"last_affected":"1a0e9e43a03e37ddecfb6b49e9b078d6e1803d05"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"0"},{"last_affected":"6.5.1.202602"}]}]}}],"versions":["v6.4.1_rel","v6.5.1.202602_rel","v6.5.0.202601_rel","v6.4.5.202504_rel","v6.4.4.202503a","v.6.4.4.202503_rel","v6.4.3_rel","v6.4.2_rel","v6.4.0_rel","v6.3.0_rel","v6.2.1_rel","v6.2.0_rel","v6.1.12_rel","v6.1.11_rel","v6.1.10_rel","v6.1.9_rel","v6.1.8_rel","v6.1.7_rel","v6.1.6_rel","v6.1.5_rel","v6.1.4_rel","v6.1.3_rel","v6.1.2_rel","v6.1_rel","v6.0.2_rel","v6.0.1_rel","v6.0_rel"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93475.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}