CVE-2026-50263

MEDIUMPre-NVD 5.55.5—Trending — Patch released this week

5.5

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.

CVSS v3: 5.5
EG Score: 5.5(high)
EPSS: 8.0%
KEV: Not listed

Published

June 5, 2026

Last Modified

June 22, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026

Patch available. Sources: redhat.

generic

Jira

https://redhat.atlassian.net/browse/PSIRTSUPT-16950

generic

X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

https://lists.x.org/archives/xorg-announce/2026-June/003702.html

generic

saver: re-fetch screen private after CheckScreenPrivate in CreateSaverWindow (ecc634f1) · Commits · xorg / xserver · GitLab

https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05

redhat

2485388 – (CVE-2026-50263) CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()

https://bugzilla.redhat.com/show_bug.cgi?id=2485388

redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-50263

Vendor Advisories for CVE-2026-50263(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	xorg-x11-server-0:1.20.11-34.el9_8.2	2026-06-17	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-20.el8_10.2	2026-06-17	redhat
redhat	xorg-x11-server-0:1.20.11-28.el8_10.2	2026-06-17	redhat
redhat	xorg-x11-server-Xwayland-0:24.1.9-4.el9_8.2	2026-06-17	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

Data Freshness Timeline

(refreshed 26× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-21 14:56 UTCEPSS rescore
2026-06-21 14:56 UTCEPSS rescore
2026-06-21 01:59 UTCEPSS rescore
2026-06-21 01:59 UTCEPSS rescore
2026-06-20 17:37 UTCEG score recompute
2026-06-20 17:37 UTCVendor advisory
2026-06-20 17:36 UTCGHSA enrichment
2026-06-19 19:26 UTCEPSS rescore
2026-06-19 19:26 UTCEPSS rescore
2026-06-19 15:07 UTCEG score recompute
2026-06-19 15:07 UTCVendor advisory
2026-06-19 15:07 UTCGHSA enrichment
2026-06-18 17:52 UTCEPSS rescore
2026-06-18 17:52 UTCEPSS rescore
2026-06-18 12:59 UTCEG score recompute
2026-06-18 12:59 UTCVendor advisory
2026-06-18 12:59 UTCGHSA enrichment
2026-06-17 17:53 UTCEPSS rescore
2026-06-17 10:41 UTCEG score recompute
2026-06-17 10:41 UTCGHSA enrichment
2026-06-16 17:53 UTCEPSS rescore
2026-06-16 08:33 UTCEG score recompute
2026-06-16 08:33 UTCVendor advisory
2026-06-16 08:33 UTCGHSA enrichment
2026-06-15 17:49 UTCEPSS rescore

Show 35 more

2026-06-15 17:49 UTCEPSS rescore
2026-06-15 06:22 UTCEG score recompute
2026-06-15 06:22 UTCVendor advisory
2026-06-15 06:22 UTCGHSA enrichment
2026-06-14 23:18 UTCEPSS rescore
2026-06-14 04:18 UTCEG score recompute
2026-06-14 04:18 UTCVendor advisory
2026-06-14 04:18 UTCGHSA enrichment
2026-06-13 23:00 UTCEPSS rescore
2026-06-13 02:05 UTCEG score recompute
2026-06-13 02:05 UTCVendor advisory
2026-06-13 02:05 UTCGHSA enrichment
2026-06-12 23:12 UTCEPSS rescore
2026-06-12 23:12 UTCEPSS rescore
2026-06-12 00:02 UTCEG score recompute
2026-06-12 00:02 UTCVendor advisory
2026-06-12 00:02 UTCGHSA enrichment
2026-06-11 14:00 UTCEPSS rescore
2026-06-10 22:19 UTCEPSS rescore
2026-06-10 21:59 UTCEG score recompute
2026-06-10 21:59 UTCGHSA enrichment
2026-06-10 13:22 UTCEPSS rescore
2026-06-09 19:56 UTCEG score recompute
2026-06-09 19:55 UTCGHSA enrichment
2026-06-08 17:52 UTCEG score recompute
2026-06-08 17:52 UTCGHSA enrichment
2026-06-08 14:17 UTCEPSS rescore
2026-06-07 15:49 UTCEG score recompute
2026-06-07 15:49 UTCGHSA enrichment
2026-06-07 15:25 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-06 13:45 UTCEG score recompute
2026-06-06 13:45 UTCGHSA enrichment
2026-06-05 22:47 UTCEPSS rescore
2026-06-05 11:42 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-50263?

CVE-2026-50263 is a medium vulnerability published on June 5, 2026. 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.

When was CVE-2026-50263 disclosed?

CVE-2026-50263 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-50263 actively exploited?

CVE-2026-50263 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-50263?

CVE-2026-50263 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2026-50263?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50263, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-50263

Explore →

Is Your Infrastructure Affected by CVE-2026-50263?

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CVE-2026-50263

Published

Last Modified

Advisory Details (5)

Jira

X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

saver: re-fetch screen private after CheckScreenPrivate in CreateSaverWindow (ecc634f1) · Commits · xorg / xserver · GitLab

2485388 – (CVE-2026-50263) CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()

cve-details

Vendor Advisories for CVE-2026-50263(6)

Patch Availability(4)

Weakness Classification(1)

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-50263?

Same vendor

Same CWE

CVE-2026-50263

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

Jira

X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

saver: re-fetch screen private after CheckScreenPrivate in CreateSaverWindow (ecc634f1) · Commits · xorg / xserver · GitLab

2485388 – (CVE-2026-50263) CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()

cve-details

📣 Vendor Advisories for CVE-2026-50263(6)

Patch Availability(4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-50263?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

Advisory Details (5)

Vendor Advisories for CVE-2026-50263(6)

Frequently asked(5)

Related CVEs(same vendor + same CWE)