CVE-2026-92449 — Binary resource loader: unbounded map_id from a theme file causes a heap out-of-bounds write in the GUIX-allocated ar…

Description (CNA)

`_gx_binres_pixelmap_table_load()` in the GUIX binary resource (theme) loader indexes the pixelmap table with a value read verbatim from the resource file and never bounds it against the table size. A crafted theme drives a write of up to roughly 256 KB past the end of the table. The overflowed buffer is allocated by GUIX itself, through `_gx_system_memory_allocator`, rather than supplied by the caller, so the loader corrupts its own arena. 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.

Affected (CNA)

Vendor / product	Versions
Eclipse Foundation / Eclipse ThreadX - GUIX	affected 6.3.0 through 6.5.1.202602a; unaffected 6.5.2.202603

CWE

CWE-129, CWE-457, CWE-787

References

https://github.com/eclipse-threadx/guix/security/advisories/GHSA-m85v-2ccm-w6gf

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.