CVE-2026-93475 (GCVE-0-2026-93475)
Vulnerability from cvelistv5 – Published: 2026-10-20 15:04 – Updated: 2026-10-20 17:02
VLAI
EPSS
VEX
Title
Out-of-bounds Write via an Unbounded RSA Modulus in NetX Secure X.509
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-20 17:02 UTC
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Eclipse Foundation | Eclipse ThreadX - NetX Duo |
Affected:
0 , ≤ 6.5.1.202602
(semver)
Unaffected: 6.5.2.202603 |
guessed |
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| Author | Source | Type | Date | Other |
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