# CVE-2026-91057: Eclipse ThreadX GUIX multi-line text view out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-91057-gx-multi-line-text-view-display-info-get-reads-one-byte-past-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91057 · Severity: info · Published 2026-10-20

Eclipse ThreadX GUIX is a graphics library used in embedded systems and IoT devices to render user interfaces. When a multi-line text widget is given a string ending with a carriage return character, the library reads one byte past the end of the application's text buffer, which can crash the device or expose adjacent memory. The vulnerability affects ordinary rendering with no special configuration required.

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

## Quick answers

**Is CVE-2026-91057 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91057 being exploited in the wild.

**How severe is CVE-2026-91057?** Informational severity, published 20 October 2026.

**Which products and versions are affected?** Eclipse ThreadX GUIX <= 6.5.1.202602a.

**Is there a fix for CVE-2026-91057?** Yes: fixed in GUIX 6.5.2.202603. Until then: Set GX_STYLE_TEXT_COPY on the widget so GUIX copies text into its own NUL-terminated storage, or ensure application text passed to multi-line text views does not end with a lone carriage return.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-10-02"},{"kind":"advisory","at":"2026-10-20"}] Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-91057 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-91057?** Check whether you run Eclipse ThreadX GUIX 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 GUIX 6.5.2.202603

Set GX_STYLE_TEXT_COPY on the widget so GUIX copies text into its own NUL-terminated storage, or ensure application text passed to multi-line text views does not end with a lone carriage return.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-10-02"},{"kind":"advisory","at":"2026-10-20"}]

## Technical details

The `_gx_multi_line_text_view_display_info_get()` function in gx_multi_line_text_view_display_info_get.c performs an unchecked read of the byte following a carriage return to distinguish between `\r` and `\r\n` line terminators, without verifying that the byte remains within the GX_STRING's declared length. This out-of-bounds read can advance the caller's index past the string end, triggering a second out-of-bounds read in `_gx_multi_line_text_view_string_total_rows_compute()` if the adjacent byte is `0x0A`. Local, low-privilege code can trigger this via any multi-line text widget with text ending in carriage return; impact is memory read disclosure (single byte, not attacker-chosen) and potential denial of service on systems where the buffer sits at a memory boundary.

## Affected products

- Eclipse ThreadX GUIX <= 6.5.1.202602a

## References

- [https://github.com/eclipse-threadx/guix/security/advisories/GHSA-4qjc-2g93-36m2](https://github.com/eclipse-threadx/guix/security/advisories/GHSA-4qjc-2g93-36m2)

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