CVE-2026-88806
libX11 XkbGetMap Reply Heap-based Buffer Overflow
HIGH
7.5
CVSS Score
Published: September 21, 2026 at 01:42 PM UTC
Updated: September 22, 2026 at 07:51 PM UTC
1 product affected across 1 vendorLIBX11
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Severity
HIGH7.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.5HIGHsuse
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusAWAITING ANALYSIS
CWE
CWE-122
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