High severity · published Oct 20, 2026
CVE-2026-92853
Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure
8.7
CVSS
0.3%
EPSS
No
On KEV
Description
The TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned length to `0xFFFFFFFF`, which makes the bounds check that follows vacuous and sends the parser reading past the session packet buffer.
The trigger is a four-byte handshake header and requires no cryptographic validity. It is reachable pre-authentication.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ET
Eclipse ThreadX - NetX Duo · Eclipse Foundation
through 6.5.1.202602 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92853
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92853
github.com
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-893m-9g4r-4992
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