CVE-2026-50262

EUVD-2026-34819
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
Affected Products (NVD)
VendorProductVersion
x.orgx_server
𝑥
< 21.1.23
x.orgxwayland
𝑥
< 24.1.12
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
redhatenterprise_linux
9.0
redhatenterprise_linux
10.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
xorg-server
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
2:21.1.23-1
fixed
sid
2:21.1.23-1
fixed
trixie
2:21.1.16-1.3+deb13u3
fixed
trixie (security)
2:21.1.16-1.3+deb13u3
fixed
xwayland
bookworm
ignored
forky
2:24.1.12-1
fixed
sid
2:24.1.12-1
fixed
trixie
ignored
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
tigervnc
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-icons
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-license
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-selinux
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-server
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-server-minimal
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
tigervnc-server-module
RHEL 8
0:1.15.0-10.el8_10
fixed
RHEL 9
0:1.15.0-7.el9_8.2
fixed
xorg-x11-server-Xdmx
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-Xephyr
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-Xnest
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-Xorg
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-Xvfb
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-Xwayland
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 9
0:24.1.9-4.el9_8.2
fixed
xorg-x11-server-Xwayland-devel
RHEL 9
0:24.1.9-4.el9_8.2
fixed
xorg-x11-server-common
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 8.4 AUS
0:1.20.10-5.el8_4
fixed
RHEL 8.6 AUS
0:1.20.11-8.el8_6
fixed
RHEL 8.8 E4S
0:1.20.11-19.el8_8
fixed
RHEL 8.8 TUS
0:1.20.11-19.el8_8
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-devel
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
xorg-x11-server-source
RHEL 8
0:1.20.11-28.el8_10.2
fixed
RHEL 9
0:1.20.11-34.el9_8.2
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
tigervnc
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-debuginfo
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-debugsource
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-icons
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-license
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-selinux
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server-debuginfo
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server-minimal
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server-minimal-debuginfo
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server-module
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
tigervnc-server-module-debuginfo
Amazon Linux 2023
0:1.14.1-3.amzn2023.0.6
fixed
xorg-x11-server-Xdmx
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
xorg-x11-server-Xephyr
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xephyr-debuginfo
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xnest
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xnest-debuginfo
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xorg
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xorg-debuginfo
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xvfb
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xvfb-debuginfo
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-Xwayland
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:24.1.3-1.amzn2023.0.5
fixed
xorg-x11-server-Xwayland-debuginfo
Amazon Linux 2023
0:24.1.3-1.amzn2023.0.5
fixed
xorg-x11-server-Xwayland-debugsource
Amazon Linux 2023
0:24.1.3-1.amzn2023.0.5
fixed
xorg-x11-server-Xwayland-devel
Amazon Linux 2023
0:24.1.3-1.amzn2023.0.5
fixed
xorg-x11-server-common
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-debuginfo
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-debugsource
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-devel
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
xorg-x11-server-source
Amazon Linux 2
0:1.20.4-22.amzn2.0.12
fixed
Amazon Linux 2023
0:21.1.13-5.amzn2023.0.10
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
xorg-x11-server-Xwayland
Azure Linux 3.0
0:24.1.12-1.azl3
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://access.redhat.com/errata/RHSA-2026:26562
https://access.redhat.com/errata/RHSA-2026:26566
https://access.redhat.com/errata/RHSA-2026:26590
https://access.redhat.com/errata/RHSA-2026:26610
https://access.redhat.com/errata/RHSA-2026:26709
https://access.redhat.com/errata/RHSA-2026:28923
https://access.redhat.com/errata/RHSA-2026:29844
https://access.redhat.com/errata/RHSA-2026:36083
https://access.redhat.com/errata/RHSA-2026:36085
https://access.redhat.com/errata/RHSA-2026:36086
https://access.redhat.com/errata/RHSA-2026:36087
https://access.redhat.com/errata/RHSA-2026:36632
https://access.redhat.com/errata/RHSA-2026:36633
https://access.redhat.com/errata/RHSA-2026:36634
https://access.redhat.com/errata/RHSA-2026:36768
https://access.redhat.com/errata/RHSA-2026:36791
https://access.redhat.com/errata/RHSA-2026:36792
https://access.redhat.com/errata/RHSA-2026:36798
https://access.redhat.com/errata/RHSA-2026:38502
https://access.redhat.com/errata/RHSA-2026:38810
https://access.redhat.com/security/cve/CVE-2026-50262
https://bugzilla.redhat.com/show_bug.cgi?id=2485387
https://gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145
https://lists.x.org/archives/xorg-announce/2026-June/003702.html
https://redhat.atlassian.net/browse/PSIRTSUPT-16950