CVE-2026-55999
8.5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| X.Org | xorg-server | 0 < 21.1.24 | affected |
| X.Org | xwayland | 0 < 24.1.13 | affected |
Weaknesses
- CWE-122: CWE-122 Heap-based buffer overflow
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
- https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1
- https://www.openwall.com/lists/oss-security/2026/07/08/2
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