CVE-2026-103416

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-07 · updated 2026-10-07
Weakness: CWE-787

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.

Affected products

Eclipse Foundation NetX Duo: through 6.5.1.202602

References

https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4x76-j955-qhq2
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/356

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