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.
Metrics
Affected Vendors & Products
No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Tue, 20 Oct 2026 17:30:00 +0000
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ssvc
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Tue, 20 Oct 2026 15:30:00 +0000
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| 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. | |
| Title | Out-of-bounds Write via an Unbounded RSA Modulus in NetX Secure X.509 | |
| Weaknesses | CWE-1284 CWE-787 |
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| References |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: eclipse
Published:
Updated: 2026-10-20T17:02:52.372Z
Reserved: 2026-09-23T13:42:24.314Z
Link: CVE-2026-93475
Updated: 2026-10-20T17:02:48.482Z
Status : Received
Published: 2026-10-20T16:17:17.520
Modified: 2026-10-20T18:17:23.060
Link: CVE-2026-93475
No data.
OpenCVE Enrichment
Updated: 2026-10-20T18:15:14Z