# CVE-2026-118052: Eclipse ThreadX Module Manager mutex deadlock in preamble size validation

Source: https://junglewise.ai/threats/cve-2026-118052-in-eclipse-threadx-versions-6-0-1-through-6-5-2-202603-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-118052 · Severity: info · Published 2026-11-02

Eclipse ThreadX is a real-time operating system kernel used in embedded and IoT devices. When loading a module with crafted data or stack sizes, the Module Manager fails to release its protection lock, permanently freezing all module operations (load, start, stop, unload) from other threads until system reset. An attacker who can supply malicious module images can disable device functionality.

Technologies: [Eclipse ThreadX](https://junglewise.ai/threats/technologies/threadx). Vendors: [Eclipse](https://junglewise.ai/threats/vendors/eclipse).

## Quick answers

**Is CVE-2026-118052 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118052 being exploited in the wild.

**How severe is CVE-2026-118052?** Informational severity, published 2 November 2026.

**Which products and versions are affected?** Eclipse ThreadX 6.0.1 through 6.5.2.202603.

**Is there a fix for CVE-2026-118052?** Yes: fixed in ThreadX 6.5.2.202603b. Until then: Validate module preamble data and stack sizes before loading; restrict module loading to trusted sources; use module signing and verification to prevent loading of crafted images. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-118052 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-118052?** Check whether you run Eclipse ThreadX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in ThreadX 6.5.2.202603b

Validate module preamble data and stack sizes before loading; restrict module loading to trusted sources; use module signing and verification to prevent loading of crafted images.

## Technical details

The Module Manager's internal load functions (_txm_module_manager_internal_load and _txm_module_manager_absolute_load_extended) take a mutex, compute module memory allocations from preamble fields using TXM_MODULE_MANAGER_UTIL_MATH_ADD_ULONG, and return directly on overflow without releasing the mutex. This creates a deadlock: other threads attempting module operations wait indefinitely for the held lock. The vulnerability requires local privilege (low) and affects systems loading untrusted module images.

## Affected products

- Eclipse ThreadX 6.0.1 through 6.5.2.202603

## Timeline

- 2026-11-01: disclosed
- 2026-11-02: advisory

## References

- [https://github.com/eclipse-threadx/threadx/security/advisories/GHSA-67ww-q8x2-g487](https://github.com/eclipse-threadx/threadx/security/advisories/GHSA-67ww-q8x2-g487)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work_items/511](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/511)

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