CVE-2026-88806
libX11 XkbGetMap Reply Heap-based Buffer Overflow
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
| CWE | CWE-122 |
| Vendor | x.org |
| Product | libx11 |
| Published | Sep 21, 2026 |
| Last Updated | Sep 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
x.org / libX11
0 < 1.8.14
References
Credits
Adam Bedard working with TrendAI Zero Day Initiative Claude:claude-opus-4-6