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CVE WatchJul 15, 2026

CVE-2026-50258

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLe

CVSS

7.8

High

EPSS

0.2%

p6

KEV

—

Exploit Today

2

0-100

Published: Jun 5, 2026 · Last modified: Jul 15, 2026 · CWE-121

EPSS · 30d
0.2%EPSS · 30 days0.2%
2026-06-302026-07-17
Technical description

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Official references
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