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NVD / CVE Program· CNA redhat

CVE-2026-50262: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.0 24.1.12-1.

Low priority for now. Upgrade to azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.0 24.1.12-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 5, 2026
Updated
Sep 28, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
5.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-50262

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
x.orgx server
x.orgxwayland
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat enterprise linux10.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • x.org x serverbefore 21.1.23
  • x.org xwaylandbefore 24.1.12

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:24.1.9-4.el10_2.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:24.1.5-6.el10_0.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION

    • 0:1.1.0-25.el6_10.18 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:1.20.4-35.el7_9 and laternot affected · rpm
    • 0:1.8.0-36.el7_9.5 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:21.1.3-20.el8_10.2 and laternot affected · rpm
    • 0:1.20.11-28.el8_10.2 and laternot affected · rpm
    • 0:1.15.0-10.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:1.20.10-5.el8_4 and laternot affected · rpm
    • 0:1.11.0-8.el8_4.16 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:1.20.10-5.el8_4 and laternot affected · rpm
    • 0:1.11.0-8.el8_4.16 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 0:1.20.11-8.el8_6 and laternot affected · rpm
    • 0:21.1.3-2.el8_6.7 and laternot affected · rpm
    • 0:1.12.0-6.el8_6.18 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

    • 0:1.20.11-8.el8_6 and laternot affected · rpm
    • 0:21.1.3-2.el8_6.7 and laternot affected · rpm
    • 0:1.12.0-6.el8_6.18 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 0:1.20.11-19.el8_8 and laternot affected · rpm
    • 0:21.1.3-13.el8_8.1 and laternot affected · rpm
    • 0:1.12.0-15.el8_8.18 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

    • 0:1.20.11-19.el8_8 and laternot affected · rpm
    • 0:21.1.3-13.el8_8.1 and laternot affected · rpm
    • 0:1.12.0-15.el8_8.18 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10xorg-x11-server-Xwaylandbefore 24.1.9-4.el10_2.224.1.9-4.el10_2.2
AlmaLinux:10xorg-x11-server-Xwayland-develbefore 24.1.9-4.el10_2.224.1.9-4.el10_2.2
AlmaLinux:8tigervncbefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-iconsbefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-licensebefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-selinuxbefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-serverbefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-server-minimalbefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8tigervnc-server-modulebefore 1.15.0-10.el8_101.15.0-10.el8_10
AlmaLinux:8xorg-x11-server-commonbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-develbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-sourcebefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xdmxbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xephyrbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xnestbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xorgbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xvfbbefore 1.20.11-28.el8_10.21.20.11-28.el8_10.2
AlmaLinux:8xorg-x11-server-Xwaylandbefore 21.1.3-20.el8_10.221.1.3-20.el8_10.2
AlmaLinux:9tigervncbefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2
AlmaLinux:9tigervnc-iconsbefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2
AlmaLinux:9tigervnc-licensebefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2
AlmaLinux:9tigervnc-selinuxbefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2
AlmaLinux:9tigervnc-serverbefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2
AlmaLinux:9tigervnc-server-minimalbefore 1.15.0-7.el9_8.21.15.0-7.el9_8.2

+96

Same product

x.org: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-6816Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
    40Plan
  • CVE-2018-14665A flaw was found in xorg-x11-server before 1.20.3.
    40Plan
  • CVE-2007-6427The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte
    38Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-50260Jun 5, 2026 · Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()
    31Monitor
  • ← EarlierCVE-2026-50261Jun 5, 2026 · Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter()
    31Monitor
  • Later →CVE-2026-50263Jun 5, 2026 · Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.024.1.12-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:tigervnc1.15.0-10.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:tigervnc-icons1.15.0-10.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:xorg-x11-server-common1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-devel1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-source1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xdmx1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xephyr1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xnest1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xorg1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xvfb1.20.11-34.el9_8.2 · AlmaLinux:9Package registry (OSV)
almalinux:xorg-x11-server-Xwayland21.1.3-20.el8_10.2 · AlmaLinux:8Package registry (OSV)
almalinux:xorg-x11-server-Xwayland-devel24.1.9-4.el10_2.2 · AlmaLinux:10Package registry (OSV)
debian:xorg-server2:21.1.7-3+deb12u13 · Debian:12Package registry (OSV)
debian:xwayland2:24.1.12-1 · Debian:14Package registry (OSV)
red hat:xorg-x11-server0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xdmx0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xdmx-debuginfo0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xephyr0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xephyr-debuginfo0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xnest0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xnest-debuginfo0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xorg0:1.20.11-34.el9_8.2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xwayland0:21.1.3-20.el8_10.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xwayland-debuginfo0:21.1.3-20.el8_10.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xwayland-debugsource0:21.1.3-20.el8_10.2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:xorg-x11-server-Xwayland-devel0:24.1.9-4.el10_2.2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:tigervnc0:1.15.0-10.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:xorg-x11-server0:1.20.11-34.el9_8.2 · Rocky Linux:9Package registry (OSV)
rocky linux:xorg-x11-server-Xwayland0:21.1.3-20.el8_10.2 · Rocky Linux:8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-3400031 days apartXwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records