High 8.4Published Oct 14, 2026

CVE-2026-103414The GUIX binary resource (theme) loader sizes its arena and populates it in two separate passes that traverse the resource file with independent cursor arithmetic.

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects Eclipse Foundation GUIX. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.16%, higher than 5% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.4 HIGH (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.16% (percentile 5)
Assigned by: eclipse
NVD analysis: Awaiting Analysis
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Eclipse Foundation GUIX eclipse_foundation:guix (from the name)	through 6.5.1.202602a; 6.5.2.202603 not affected	CNA record

References

https://github.com/eclipse-threadx/guix/security/advisories/GHSA-m2f3-cv9x-68q7
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/358

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.