Is CVE-2026-50262 in the CISA KEV catalog?

No. CVE-2026-50262 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-50262?

CVE-2026-50262 has a CVSS v3 base score of 5.5 (Moderate).

What is the EPSS score for CVE-2026-50262?

CVE-2026-50262 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-50262?

Upgrade xorg-server on debian 13 to 2:21.1.16-1.3+deb13u3 or later. Fixes are available for 65 affected products.

CVE & CISA-KEV Catalog

CVE-2026-50262

MEDIUM

5.5

CVSS v3

NVD

Description

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:21.1.16-1.3+deb13u3CVE-2026-50262

Fixed in:2:21.1.23-1CVE-2026-50262

tigervncRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervncRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-debuginfoRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-debuginfoRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-debugsourceRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-debugsourceRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-iconsRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-iconsRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-licenseRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-licenseRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-selinuxRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-selinuxRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-serverRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-serverRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-debuginfoRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-debuginfoRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-minimalRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-minimalRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-minimal-debuginfoRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-minimal-debuginfoRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-moduleRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-moduleRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-module-debuginfoRocky

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

tigervnc-server-module-debuginfoRed Hat / RHEL

Fixed in:0:1.15.0-10.el8_10RHSA-2026:28923

Fixed in:0:1.15.0-7.el9_8.2RHSA-2026:29844

xorg-x11-serverRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-serverRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XdmxRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XdmxRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xdmx-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xdmx-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XephyrRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XephyrRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xephyr-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xephyr-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XnestRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XnestRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xnest-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xnest-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XorgRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XorgRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xorg-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xorg-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XvfbRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XvfbRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xvfb-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-Xvfb-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-XwaylandRocky

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-XwaylandRed Hat / RHEL

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-debuginfoRed Hat / RHEL

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-debuginfoRocky

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-debugsourceRed Hat / RHEL

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-debugsourceRocky

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:21.1.3-20.el8_10.2RHSA-2026:26562

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-develRocky

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-Xwayland-develRed Hat / RHEL

Fixed in:0:24.1.9-4.el10_2.2RHSA-2026:26566

Fixed in:0:24.1.9-4.el9_8.2RHSA-2026:26590

xorg-x11-server-commonRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-commonRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-debuginfoRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-debugsourceRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-debugsourceRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-develRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-develRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-sourceRocky

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

xorg-x11-server-sourceRed Hat / RHEL

Fixed in:0:1.20.11-28.el8_10.2RHSA-2026:26709

Fixed in:0:1.20.11-34.el9_8.2RHSA-2026:26610

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Patch1

gitlab.freedesktop.org

Vendor Advisory3

Other references8

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-25.