CVE-2026-103414 Memory corruption in GUIX
A heap buffer overflow in the GUIX binary resource loader allows attackers to execute arbitrary code via a malicious theme file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103414?
CVE-2026-103414 is a high-severity memory corruption vulnerability in Eclipse Foundation GUIX, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
The GUIX binary resource (theme) loader sizes its arena and populates it in two separate passes that traverse the resource file with independent cursor arithmetic. Because `gx_page_header_data_size` is never validated against the glyph data a page actually contains, the two passes can read different page headers for the same font page, derive different glyph counts, and reserve less than the load pass writes. The excess is written past the end of the arena, with content taken verbatim from the file.
The overflowed buffer is allocated by GUIX itself, through `_gx_system_memory_allocator`, rather than supplied by the caller. The public API `gx_binres_theme_load()` takes no size parameter, so no amount of caller diligence prevents this.
Reproduces in the shipped default configuration; `GX_BINARY_RESOURCE_SUPPORT` is enabled by default.
Weakness: CWE-787
Which versions are affected by CVE-2026-103414?
How do I fix CVE-2026-103414?
No fix has been published for CVE-2026-103414 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-103414 being exploited?
There is no known exploitation of CVE-2026-103414 in the wild and no public exploit code.
Sources
Also known as GHSA-m2f3-cv9x-68q7.