{"id":"CVE-2026-92449","title":"Binary resource loader: unbounded map_id from a theme file causes a heap out-of-bounds write in the GUIX-allocated arena","summary":"`_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 t…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-129","CWE-457","CWE-787"],"vendor":"Eclipse Foundation","product":"GUIX","affected":["GUIX >= 6.3.0 <= 6.5.1.202602a"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-20T15:27:16.562385Z"},"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T15:27:55.848Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-92449","references":[{"url":"https://github.com/eclipse-threadx/guix/security/advisories/GHSA-m85v-2ccm-w6gf"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T15:09:24.113Z","slug":"CVE-2026-92449","body":"## Overview\n\n`_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.\n\n\n\nThe 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.\n\n\n\nReproduces in the shipped default configuration; `GX_BINARY_RESOURCE_SUPPORT` is enabled by default.\n\n## Affected\n\n- `GUIX >= 6.3.0 <= 6.5.1.202602a`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":37.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}