CVE-2026-88806
libX11 XkbGetMap Reply Heap-based Buffer Overflow
CVSS v3
7.5
HIGH
EPSS Score
0.2 %
exploit probability, as of 2026-09-28
CISA KEV
No
known exploited
Exploitation
none
SSVC status
Description
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Technical details
- Published
- 2026-09-21
- Last Modified
- 2026-09-22
Frequently asked questions
What is CVE-2026-88806?
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Is CVE-2026-88806 actively exploited?
Active exploitation of CVE-2026-88806 has not been confirmed. Its EPSS score was 0.2% on 2026-09-28, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-88806?
CVE-2026-88806 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2026-88806 affecting your environment?
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