What’s Vulnerable › Vulnerabilities
CVE-2026-88806: libX11 XkbGetMap Reply Heap-based Buffer Overflow
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-21 · updated 2026-09-22
- Weakness: CWE-122
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.
Affected products
- x.org libX11: before 1.8.14 — fixed in 1.8.14
How to fix
Upgrade to a fixed version: x.org libX11 1.8.14. Check the vendor advisory for mitigations.
References
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