Skip to main content

CVE-2026-50263

5.5
MEDIUMCVSS v3.1 Base Score
0.14%
LOW RiskEPSS (3rd percentile)

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.

Published: 6/5/2026
Modified: 6/24/2026
Back to CVE Lookup

Vulnerability Summary

CVSS v3 Score

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Score (Exploitation Probability)

0.14%LOW Exploitation Risk
3rd percentile

This vulnerability has a 0.14% probability of being exploited in the next 30 days, ranking higher than 3% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-416)

CVE-2026-53462MEDIUM 5.9

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-50 and 7.1.2-25, when an allocation fails in CheckPrimitiveExtent this can result in a heap-use-after-free and result in a crash. This issue has been patched in versions 6.9.13-50 and 7.1.2-25.

6/10/2026
CVE-2026-34696HIGH 7.8

InDesign Desktop versions 21.3, 20.5.3 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

6/9/2026
CVE-2026-50261HIGH 7.8

A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.

6/5/2026
CVE-2026-50260HIGH 7.8

A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.

6/5/2026
CVE-2026-50257HIGH 7.8

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.

6/5/2026

Similar SeverityMEDIUM