PULSE
ES
FEED
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CVE WatchAug 5, 2026

CVE-2026-50263

A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after

CVSS

5.5

Medium

EPSS

0.1%

p3

KEV

—

Exploit Today

1

0-100

Published: Jun 5, 2026 · Last modified: Aug 5, 2026 · CWE-416

EPSS · 30d
0.1%EPSS · 30 days0.2%
2026-09-302026-10-27
Technical description

A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.

Official references
Related CVEs
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CVE-2026-935165.5 MED
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———A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X Clients to crash the X server or potentially execute code in X server context.14hCVE-2026-93515—
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———A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the X server context.14hCVE-2026-1183578.8 HIG
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——0Use after free in FileSystem in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)9hCVE-2026-1183568.8 HIG
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——0Use after free in WTF in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)9hCVE-2026-1183538.8 HIG
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——0Use after free in Paint in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)8hCVE-2026-1183508.8 HIG
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——0Use after free in Turbolev in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)8h