CVE-2026-91189
CVE-2026-91189 · GUIX binary resource loader: unvalidated glyph range causes an integer underflow and a heap out-of-bounds write when loading an untrusted font or theme
Diese Seite enthält Fakten aus öffentlichen Sicherheitsquellen. Lesen Sie vor dem Aktualisieren die Originalmeldung.
The GUIX binary resource loader never checks that a font page's glyph range is well formed. `gx_page_header_first_glyph` and `gx_page_header_last_glyph` are read verbatim from the file and only the upper bound of `last_glyph` is validated, so a page declaring `first_glyph > last_glyph` makes `last - first + 1` underflow to a very large unsigned count. That count is multiplied by a glyph record size to reserve the load buffer, and the multiply is unchecked, so it wraps to a small value and the loader allocates a buffer far smaller than the data it is about to write. The load pass then recomputes the count in a narrower type and writes attacker-controlled glyph records into the undersized buffer.
CVSS 7.1 · Hoch · EPSS 0,1% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Betroffene Produkte und Versionen
eclipse threadx - guix
- Softwareversionen
- ≥ 0, ≤ 6.5.1.202602a: Betroffen (semver)
- 6.5.2.202603: Nicht betroffen
Auf 6.5.2.202603 aktualisieren