CVE-2026-92853

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.

Score

CVSS 4.0 8.7 High

Status

Awaiting Analysis - emo@eclipse.org

Published

2026-10-20

Last modified

2026-10-20

Weaknesses

CWE-125, CWE-191

Affected products

• Eclipse Threadx - Netx Duo (Eclipse Foundation)

References

• https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-893m-9g4r-4992