Undefined Behavior in NetX Duo HTTP PUT: Uninitialized File Close
CVE-2026-11576 Published on June 19, 2026

The security fix for CVE-2025-0728 in eclipse-threadx NetX Duo refactors error handling in the HTTP server PUT process to use a shared cleanup label, but this unified cleanup path unconditionally calls fx_file_close() even when the file was never successfully opened. Multiple error branches jump to the shared cleanup label before any file open operation has occurred, causing fx_file_close() to operate on an uninitialized file handle, leading to undefined behavior, double-close issues, or memory corruption.

NVD

Vulnerability Analysis

CVE-2026-11576 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Types

What is a Double-free Vulnerability?

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. When a program calls free() twice with the same argument, the program's memory management data structures become corrupted. This corruption can cause the program to crash or, in some circumstances, cause two later calls to malloc() to return the same pointer. If malloc() returns the same value twice and the program later gives the attacker control over the data that is written into this doubly-allocated memory, the program becomes vulnerable to a buffer overflow attack.

CVE-2026-11576 has been classified to as a Double-free vulnerability or weakness.

What is an Insufficient Cleanup Vulnerability?

The software does not properly "clean up" and remove temporary or supporting resources after they have been used.

CVE-2026-11576 has been classified to as an Insufficient Cleanup vulnerability or weakness.

Use of Uninitialized Resource

The software uses or accesses a resource that has not been initialized. When a resource has not been properly initialized, the software may behave unexpectedly. This may lead to a crash or invalid memory access, but the consequences vary depending on the type of resource and how it is used within the software.


Products Associated with CVE-2026-11576

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Eclipse Threadx Netx Duo
 

Affected Versions

Eclipse Foundation Eclipse ThreadX - NetX Duo: