CVE Watch15 jul 2026

CVE-2026-50259

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWi

CVSS

7.8

Alto

EPSS

0.2%

KEV

—

Exploit Today

0-100

Publicado: 5 jun 2026 · Última mod.: 15 jul 2026 · CWE-121

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-06-302026-07-17

Descripción técnica

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Referencias oficiales

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