CVE-2026-92853
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TLS 1.3 Certificate Parser Length Underflow in NetX Secure

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Eclipse Foundation

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.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-92853
EUVD
EUVD-2026-105133

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Eclipse Foundation Eclipse ThreadX - NetX Duo 0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-191 The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability involves a flaw in the TLS 1.3 Certificate-message parser in NetX Secure. When processing a zero-length Certificate message, the parser incorrectly decrements the message length to skip a non-existent context byte. This causes the unsigned length to wrap around to 0xFFFFFFFF, bypassing bounds checks and leading to out-of-bounds memory access during packet parsing.

Detection Guidance

Detecting this vulnerability requires checking the NetX Duo version in use. Commands like 'nx_system_version_get()' or inspecting library files for version strings can help. If the version is 6.5.1.202602 or earlier, the system is vulnerable.

Impact Analysis

This vulnerability can allow attackers to trigger out-of-bounds memory reads by sending a maliciously crafted TLS 1.3 Certificate message. Since it is reachable pre-authentication, it could potentially lead to denial-of-service conditions or unauthorized access to sensitive data in systems using affected NetX Secure implementations.

Compliance Impact

This vulnerability primarily impacts system availability due to crashes or hard faults, which could lead to denial-of-service conditions. While it does not directly compromise confidentiality or integrity, prolonged downtime may violate availability requirements in standards like GDPR (Article 32) or HIPAA (Security Rule).

Mitigation Strategies

Update NetX Secure to a patched version that fixes the TLS 1.3 Certificate-message parser issue. Disable TLS 1.3 if not required or use a firewall to block malformed Certificate messages.

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