Xorg server: An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). (CVE-2026-50262)
0
MediumVulnerabilityCVE-2026-50262gcveosvubuntu-cve-2026-50262cve-2026-50262ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-26-04-lts
Published: 06/05/2026 (06/05/2026, 12:16:00 UTC)
Source: GCVE Database
Product: xorg-server
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.
CVSS v3.1
Score 5.5medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected software
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=esm-infra-legacy/trustyAffected versions
=2:1.14.3-3ubuntu2=2:1.14.3-3ubuntu3=2:1.14.3-3ubuntu4=2:1.14.3-5ubuntu1=2:1.14.4-1ubuntu1=2:1.14.4-1ubuntu2=2:1.14.4.901-0ubuntu2=2:1.14.5-1ubuntu2=2:1.14.5-1ubuntu4=2:1.15.0-1ubuntu1=2:1.15.0-1ubuntu2=2:1.15.0-1ubuntu3=2:1.15.0-1ubuntu4=2:1.15.0-1ubuntu6=2:1.15.0-1ubuntu7=2:1.15.1-0ubuntu1=2:1.15.1-0ubuntu2=2:1.15.1-0ubuntu2.1=2:1.15.1-0ubuntu2.4=2:1.15.1-0ubuntu2.5=2:1.15.1-0ubuntu2.6=2:1.15.1-0ubuntu2.7=2:1.15.1-0ubuntu2.9=2:1.15.1-0ubuntu2.10=2:1.15.1-0ubuntu2.11=2:1.15.1-0ubuntu2.11+esm2=2:1.15.1-0ubuntu2.11+esm3=2:1.15.1-0ubuntu2.11+esm4=2:1.15.1-0ubuntu2.11+esm5=2:1.15.1-0ubuntu2.11+esm6=2:1.15.1-0ubuntu2.11+esm7=2:1.15.1-0ubuntu2.11+esm8=2:1.15.1-0ubuntu2.11+esm9=2:1.15.1-0ubuntu2.11+esm11=2:1.15.1-0ubuntu2.11+esm12
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=esm-infra/xenialAffected versions
=2:1.17.2-1ubuntu9=2:1.17.2-1ubuntu10=2:1.17.3-2ubuntu1=2:1.17.3-2ubuntu2=2:1.17.3-2ubuntu3=2:1.17.3-2ubuntu4=2:1.18.1-1ubuntu3=2:1.18.1-1ubuntu4=2:1.18.3-1ubuntu1=2:1.18.3-1ubuntu2=2:1.18.3-1ubuntu2.2=2:1.18.3-1ubuntu2.3=2:1.18.4-0ubuntu0.1=2:1.18.4-0ubuntu0.2=2:1.18.4-0ubuntu0.3=2:1.18.4-0ubuntu0.4=2:1.18.4-0ubuntu0.6=2:1.18.4-0ubuntu0.7=2:1.18.4-0ubuntu0.8=2:1.18.4-0ubuntu0.9=2:1.18.4-0ubuntu0.10=2:1.18.4-0ubuntu0.11=2:1.18.4-0ubuntu0.12=2:1.18.4-0ubuntu0.12+esm1=2:1.18.4-0ubuntu0.12+esm2=2:1.18.4-0ubuntu0.12+esm4=2:1.18.4-0ubuntu0.12+esm5=2:1.18.4-0ubuntu0.12+esm6=2:1.18.4-0ubuntu0.12+esm8=2:1.18.4-0ubuntu0.12+esm9=2:1.18.4-0ubuntu0.12+esm10=2:1.18.4-0ubuntu0.12+esm12=2:1.18.4-0ubuntu0.12+esm13=2:1.18.4-0ubuntu0.12+esm14=2:1.18.4-0ubuntu0.12+esm15=2:1.18.4-0ubuntu0.12+esm16=2:1.18.4-0ubuntu0.12+esm17=2:1.18.4-0ubuntu0.12+esm18
xorg-server-hwe-16.04
pkg:deb/ubuntu/xorg-server-hwe-16.04?arch=source&distro=esm-infra/xenialAffected versions
=2:1.18.4-1ubuntu6.1~16.04.1=2:1.18.4-1ubuntu6.1~16.04.2=2:1.19.3-1ubuntu1~16.04.2=2:1.19.3-1ubuntu1~16.04.3=2:1.19.3-1ubuntu1~16.04.4=2:1.19.5-0ubuntu2~16.04.1=2:1.19.6-1ubuntu4~16.04.1=2:1.19.6-1ubuntu4.1~16.04.1=2:1.19.6-1ubuntu4.1~16.04.2=2:1.19.6-1ubuntu4.1~16.04.3=2:1.19.6-1ubuntu4.1~16.04.4=2:1.19.6-1ubuntu4.1~16.04.5=2:1.19.6-1ubuntu4.1~16.04.6=2:1.19.6-1ubuntu4.1~16.04.6+esm1=2:1.19.6-1ubuntu4.1~16.04.6+esm3=2:1.19.6-1ubuntu4.1~16.04.6+esm4=2:1.19.6-1ubuntu4.1~16.04.6+esm5=2:1.19.6-1ubuntu4.1~16.04.6+esm6=2:1.19.6-1ubuntu4.1~16.04.6+esm7=2:1.19.6-1ubuntu4.1~16.04.6+esm8=2:1.19.6-1ubuntu4.1~16.04.6+esm9=2:1.19.6-1ubuntu4.1~16.04.6+esm10
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=esm-infra/bionicAffected versions
=2:1.19.5-0ubuntu2=2:1.19.6-1ubuntu1=2:1.19.6-1ubuntu2=2:1.19.6-1ubuntu3=2:1.19.6-1ubuntu4=2:1.19.6-1ubuntu4.1=2:1.19.6-1ubuntu4.2=2:1.19.6-1ubuntu4.3=2:1.19.6-1ubuntu4.4=2:1.19.6-1ubuntu4.5=2:1.19.6-1ubuntu4.6=2:1.19.6-1ubuntu4.7=2:1.19.6-1ubuntu4.8=2:1.19.6-1ubuntu4.9=2:1.19.6-1ubuntu4.10=2:1.19.6-1ubuntu4.11=2:1.19.6-1ubuntu4.12=2:1.19.6-1ubuntu4.13=2:1.19.6-1ubuntu4.14=2:1.19.6-1ubuntu4.15=2:1.19.6-1ubuntu4.15+esm1=2:1.19.6-1ubuntu4.15+esm3=2:1.19.6-1ubuntu4.15+esm4=2:1.19.6-1ubuntu4.15+esm5=2:1.19.6-1ubuntu4.15+esm7=2:1.19.6-1ubuntu4.15+esm8=2:1.19.6-1ubuntu4.15+esm9=2:1.19.6-1ubuntu4.15+esm10=2:1.19.6-1ubuntu4.15+esm11=2:1.19.6-1ubuntu4.15+esm12=2:1.19.6-1ubuntu4.15+esm13
xorg-server-hwe-18.04
pkg:deb/ubuntu/xorg-server-hwe-18.04?arch=source&distro=esm-infra/bionicAffected versions
=2:1.20.1-3ubuntu2.1~18.04.1=2:1.20.4-1ubuntu3~18.04.1=2:1.20.5+git20191008-0ubuntu1~18.04.1=2:1.20.8-2ubuntu2.1~18.04.1=2:1.20.8-2ubuntu2.2~18.04.1=2:1.20.8-2ubuntu2.2~18.04.2=2:1.20.8-2ubuntu2.2~18.04.3=2:1.20.8-2ubuntu2.2~18.04.4=2:1.20.8-2ubuntu2.2~18.04.5=2:1.20.8-2ubuntu2.2~18.04.6=2:1.20.8-2ubuntu2.2~18.04.7=2:1.20.8-2ubuntu2.2~18.04.8=2:1.20.8-2ubuntu2.2~18.04.9=2:1.20.8-2ubuntu2.2~18.04.10=2:1.20.8-2ubuntu2.2~18.04.11=2:1.20.8-2ubuntu2.2~18.04.11+esm1=2:1.20.8-2ubuntu2.2~18.04.11+esm2=2:1.20.8-2ubuntu2.2~18.04.11+esm3=2:1.20.8-2ubuntu2.2~18.04.11+esm4=2:1.20.8-2ubuntu2.2~18.04.11+esm5
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=esm-infra/focalAffected versions
=2:1.20.5+git20191008-0ubuntu1=2:1.20.6-1ubuntu1=2:1.20.7-2ubuntu1=2:1.20.7-2ubuntu2=2:1.20.8-2ubuntu2=2:1.20.8-2ubuntu2.1=2:1.20.8-2ubuntu2.2=2:1.20.8-2ubuntu2.3=2:1.20.8-2ubuntu2.4=2:1.20.8-2ubuntu2.6=2:1.20.9-2ubuntu1.1~20.04.1=2:1.20.9-2ubuntu1.2~20.04.1=2:1.20.9-2ubuntu1.2~20.04.2=2:1.20.11-1ubuntu1~20.04.2=2:1.20.13-1ubuntu1~20.04.2=2:1.20.13-1ubuntu1~20.04.3=2:1.20.13-1ubuntu1~20.04.4=2:1.20.13-1ubuntu1~20.04.5=2:1.20.13-1ubuntu1~20.04.6=2:1.20.13-1ubuntu1~20.04.8=2:1.20.13-1ubuntu1~20.04.9=2:1.20.13-1ubuntu1~20.04.12=2:1.20.13-1ubuntu1~20.04.14=2:1.20.13-1ubuntu1~20.04.15=2:1.20.13-1ubuntu1~20.04.16=2:1.20.13-1ubuntu1~20.04.17=2:1.20.13-1ubuntu1~20.04.18=2:1.20.13-1ubuntu1~20.04.19=2:1.20.13-1ubuntu1~20.04.20=2:1.20.13-1ubuntu1~20.04.20+esm1
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=jammyAffected versions
=2:1.20.13-1ubuntu1=2:1.20.13-1ubuntu2=2:1.20.14-1ubuntu1=2:21.1.3-2ubuntu2=2:21.1.3-2ubuntu2.1=2:21.1.3-2ubuntu2.2=2:21.1.3-2ubuntu2.3=2:21.1.3-2ubuntu2.4=2:21.1.3-2ubuntu2.5=2:21.1.3-2ubuntu2.6=2:21.1.3-2ubuntu2.7=2:21.1.3-2ubuntu2.8=2:21.1.3-2ubuntu2.9=2:21.1.4-2ubuntu1.7~22.04.1=2:21.1.4-2ubuntu1.7~22.04.2=2:21.1.4-2ubuntu1.7~22.04.5=2:21.1.4-2ubuntu1.7~22.04.7=2:21.1.4-2ubuntu1.7~22.04.8=2:21.1.4-2ubuntu1.7~22.04.9=2:21.1.4-2ubuntu1.7~22.04.10=2:21.1.4-2ubuntu1.7~22.04.11=2:21.1.4-2ubuntu1.7~22.04.12=2:21.1.4-2ubuntu1.7~22.04.13=2:21.1.4-2ubuntu1.7~22.04.14=2:21.1.4-2ubuntu1.7~22.04.15=2:21.1.4-2ubuntu1.7~22.04.16
xwayland
pkg:deb/ubuntu/xwayland?arch=source&distro=jammyAffected versions
=2:21.1.2-0ubuntu1=2:21.1.3-1=2:21.1.3-1ubuntu1=2:21.1.4-1=2:22.1.0-1=2:22.1.1-1=2:22.1.1-1ubuntu0.1=2:22.1.1-1ubuntu0.2=2:22.1.1-1ubuntu0.3=2:22.1.1-1ubuntu0.4=2:22.1.1-1ubuntu0.5=2:22.1.1-1ubuntu0.6=2:22.1.1-1ubuntu0.7=2:22.1.1-1ubuntu0.9=2:22.1.1-1ubuntu0.10=2:22.1.1-1ubuntu0.11=2:22.1.1-1ubuntu0.12=2:22.1.1-1ubuntu0.13=2:22.1.1-1ubuntu0.14=2:22.1.1-1ubuntu0.15=2:22.1.1-1ubuntu0.17=2:22.1.1-1ubuntu0.18=2:22.1.1-1ubuntu0.19=2:22.1.1-1ubuntu0.20
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=nobleAffected versions
=2:21.1.7-3ubuntu2=2:21.1.7-3ubuntu2.1=2:21.1.10-1ubuntu1=2:21.1.11-2ubuntu1=2:21.1.12-1ubuntu1=2:21.1.12-1ubuntu1.1=2:21.1.12-1ubuntu1.2=2:21.1.12-1ubuntu1.3=2:21.1.12-1ubuntu1.4=2:21.1.12-1ubuntu1.5=2:21.1.12-1ubuntu1.6=2:21.1.12-1ubuntu1.8
xwayland
pkg:deb/ubuntu/xwayland?arch=source&distro=nobleAffected versions
=2:23.2.0-1=2:23.2.0-1ubuntu0.1=2:23.2.3-1=2:23.2.4-1=2:23.2.4-1build1=2:23.2.4-1build2=2:23.2.4-1build3=2:23.2.6-1=2:23.2.6-1ubuntu0.1=2:23.2.6-1ubuntu0.2=2:23.2.6-1ubuntu0.4=2:23.2.6-1ubuntu0.5=2:23.2.6-1ubuntu0.6=2:23.2.6-1ubuntu0.7=2:23.2.6-1ubuntu0.8
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=questingAffected versions
=2:21.1.16-1ubuntu1=2:21.1.18-1ubuntu1=2:21.1.18-1ubuntu1.1
xwayland
pkg:deb/ubuntu/xwayland?arch=source&distro=questingAffected versions
=2:24.1.6-1=2:24.1.6-1ubuntu1=2:24.1.6-1ubuntu1.1
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=stonkingAffected versions
=2:21.1.22-1ubuntu1=2:21.1.22-1ubuntu4=2:21.1.24-1ubuntu1
xwayland
pkg:deb/ubuntu/xwayland?arch=source&distro=stonkingAffected versions
=2:24.1.10-1=2:24.1.12-1=2:24.1.13-1=2:24.1.14-1
xorg-server
pkg:deb/ubuntu/xorg-server?arch=source&distro=resoluteAffected versions
=2:21.1.18-1ubuntu1=2:21.1.21-1ubuntu1=2:21.1.22-1ubuntu1=2:21.1.22-1ubuntu1.2
xwayland
pkg:deb/ubuntu/xwayland?arch=source&distro=resoluteAffected versions
=2:24.1.6-1ubuntu1=2:24.1.8-1=2:24.1.9-1=2:24.1.10-1
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-50262
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f6102cdf04f65666411e
Added to database: 10/17/2026, 22:26:24 UTC
Last updated: 10/18/2026, 02:06:34 UTC
Views: 2
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