CVE-2026-88806— libX11 XkbGetMap Reply Heap-based Buffer Overflow
Quick assessment
Affected
x.org libX11
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
恶意 X 服务器可以利用 libX11 1.8.14 之前版本在处理 XkbGetMap 时引发的缓冲区溢出漏洞，从而导致 key_sym_map 缓冲区溢出。
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I. Basic Information for CVE-2026-88806
Vulnerability Information
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Vulnerability Title
libX11 XkbGetMap Reply Heap-based Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-88806
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Other References for CVE-2026-88806 (1)
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IV. Related Vulnerabilities
Same product: libX11
Same vendor: x.org
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V. Comments for CVE-2026-88806
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