Buffer over-read in NetX Duo - CVE-2026-102758
Published: November 9, 2026
Vulnerability identifier: #VU162964
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102758
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to trigger a one-byte out-of-bounds read during TLS certificate parsing.
The vulnerability exists due to NetX Duo's NetX Secure ASN.1 parser reading a tag before checking whether the remaining certificate buffer length is zero. An unauthenticated remote attacker can send a crafted X.509 certificate that exhausts the buffer before a subsequent parsing operation, causing a read past its end before authentication.
Affected software
NetX Duo
How to mitigate CVE-2026-102758
Install security update from vendor's website.
NetX Duo - update to 6.5.2.202603