Critical severity · published Oct 7, 2026
CVE-2026-103416
Out-of-bounds write via the TLS 1.3 handshake message cache in NetX Duo in Eclipse ThreadX NetX Duo 6.5.1.202602 allows a handshake message larger than the cache writes past it…
9.3
CVSS
0.2%
EPSS
No
On KEV
Description
Out-of-bounds write via the TLS 1.3 handshake message cache in NetX Duo in Eclipse ThreadX NetX Duo 6.5.1.202602 allows a handshake message larger than the cache writes past it and on into the rest of the session control block, which holds pointers. A malicious or compromised server can make a TLS 1.3 client produce such a message before certificate authentication completes, so no server certificate is needed to reach it.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% 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-2026-103416
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103416
gitlab.eclipse.org
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/356
github.com
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4x76-j955-qhq2
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