Vulnerability 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. It 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-93475?
CVE-2026-93475 is a documented vulnerability. 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` defau...
How severe is CVE-2026-93475?
CVSS scoring is not yet available for CVE-2026-93475. Check NVD for updates.
Is there a patch for CVE-2026-93475?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.