CVE-2026-92853 Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-92853?
CVE-2026-92853 is a high-severity vulnerability in Eclipse ThreadX - NetX Duo, published on 20 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-92853?
How do I fix CVE-2026-92853?
No fix has been published for CVE-2026-92853 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-92853 being exploited?
There is no known exploitation of CVE-2026-92853 in the wild and no public exploit code.
Sources
Also known as GHSA-893m-9g4r-4992.