CVE-2026-34001
Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption
02 Description
Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.26% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 18.1% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-10-26.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-04-23 14:54Z6 MO AGO
- Last updated
- 2026-07-15 01:04Z3 MO AGO
- Reserved
- 2026-03-25
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.8)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-825Expired Pointer DereferenceBase
- Data version
- 5.2
- Document digest
- 555eb05f264d7f5d503caa93cda1a8f7f7e03644ae3ec56ee4515246540b1790
05 Affected products
06 References
- access.redhat.comRHSA-2026:10739https://access.redhat.com/errata/RHSA-2026:10739
- access.redhat.comRHSA-2026:11352https://access.redhat.com/errata/RHSA-2026:11352
- access.redhat.comRHSA-2026:11369https://access.redhat.com/errata/RHSA-2026:11369
- access.redhat.comRHSA-2026:11388https://access.redhat.com/errata/RHSA-2026:11388
- access.redhat.comRHSA-2026:11656https://access.redhat.com/errata/RHSA-2026:11656
- access.redhat.comRHSA-2026:11692https://access.redhat.com/errata/RHSA-2026:11692
- access.redhat.comRHSA-2026:13414https://access.redhat.com/errata/RHSA-2026:13414
- access.redhat.comRHSA-2026:19125https://access.redhat.com/errata/RHSA-2026:19125
- access.redhat.comRHSA-2026:19342https://access.redhat.com/errata/RHSA-2026:19342
- access.redhat.comRHSA-2026:19343https://access.redhat.com/errata/RHSA-2026:19343
- access.redhat.comRHSA-2026:19344https://access.redhat.com/errata/RHSA-2026:19344
- access.redhat.comRHSA-2026:20547https://access.redhat.com/errata/RHSA-2026:20547
- access.redhat.comRHSA-2026:20555https://access.redhat.com/errata/RHSA-2026:20555
- access.redhat.comRHSA-2026:20557https://access.redhat.com/errata/RHSA-2026:20557
- access.redhat.comRHSA-2026:20558https://access.redhat.com/errata/RHSA-2026:20558
- access.redhat.comRHSA-2026:20560https://access.redhat.com/errata/RHSA-2026:20560
- access.redhat.comRHSA-2026:20561https://access.redhat.com/errata/RHSA-2026:20561
- access.redhat.comRHSA-2026:20562https://access.redhat.com/errata/RHSA-2026:20562
- access.redhat.comRHSA-2026:20563https://access.redhat.com/errata/RHSA-2026:20563
- access.redhat.comRHSA-2026:20575https://access.redhat.com/errata/RHSA-2026:20575
- access.redhat.comRHSA-2026:20576https://access.redhat.com/errata/RHSA-2026:20576
- access.redhat.comRHSA-2026:20590https://access.redhat.com/errata/RHSA-2026:20590
- access.redhat.comRHSA-2026:21699https://access.redhat.com/errata/RHSA-2026:21699
- access.redhat.comRHSA-2026:21712https://access.redhat.com/errata/RHSA-2026:21712
- access.redhat.comRHSA-2026:21715https://access.redhat.com/errata/RHSA-2026:21715
- access.redhat.comRHSA-2026:21716https://access.redhat.com/errata/RHSA-2026:21716
- access.redhat.comRHSA-2026:21718https://access.redhat.com/errata/RHSA-2026:21718
- access.redhat.comRHSA-2026:21741https://access.redhat.com/errata/RHSA-2026:21741
- access.redhat.comRHSA-2026:21742https://access.redhat.com/errata/RHSA-2026:21742
- access.redhat.comRHSA-2026:22424https://access.redhat.com/errata/RHSA-2026:22424
- access.redhat.comRHSA-2026:22456https://access.redhat.com/errata/RHSA-2026:22456
- access.redhat.comRHSA-2026:23254https://access.redhat.com/errata/RHSA-2026:23254
- access.redhat.comRHSA-2026:23255https://access.redhat.com/errata/RHSA-2026:23255
- access.redhat.comRHSA-2026:23496https://access.redhat.com/errata/RHSA-2026:23496
- access.redhat.comRHSA-2026:24341https://access.redhat.com/errata/RHSA-2026:24341
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-34001
- bugzilla.redhat.comRHBZ#2451109https://bugzilla.redhat.com/show_bug.cgi?id=2451109
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34001.json
07 Fixed in
AlmaLinux 8
- tigervnc Fixed in 1.15.0-9.el8_10
- tigervnc-icons Fixed in 1.15.0-9.el8_10
- tigervnc-license Fixed in 1.15.0-9.el8_10
- tigervnc-selinux Fixed in 1.15.0-9.el8_10
- tigervnc-server Fixed in 1.15.0-9.el8_10
- tigervnc-server-minimal Fixed in 1.15.0-9.el8_10
- tigervnc-server-module Fixed in 1.15.0-9.el8_10
- xorg-x11-server-Xdmx Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xephyr Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xnest Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xorg Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xvfb Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xwayland Fixed in 21.1.3-20.el8_10
- xorg-x11-server-common Fixed in 1.20.11-28.el8_10
- xorg-x11-server-devel Fixed in 1.20.11-28.el8_10
- xorg-x11-server-source Fixed in 1.20.11-28.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- tigervnc Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-icons Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-license Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-selinux Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server-minimal Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server-module Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- xorg-x11-server-Xdmx Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xephyr Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xnest Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xorg Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xvfb Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xwayland Fixed
A version is affected if any line below covers it.
- Affected before 23.2.7-6.el9_7
- Affected before 24.1.9-4.el9_8
- xorg-x11-server-Xwayland-devel Fixed
A version is affected if any line below covers it.
- Affected before 23.2.7-6.el9_7
- Affected before 24.1.9-4.el9_8
- xorg-x11-server-common Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-source Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- xorg-x11-server-Xwayland Fixed
A version is affected if any line below covers it.
- Affected before 24.1.5-6.el10_1
- Affected before 24.1.9-4.el10_2
- xorg-x11-server-Xwayland-devel Fixed
A version is affected if any line below covers it.
- Affected before 24.1.5-6.el10_1
- Affected before 24.1.9-4.el10_2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- tigervnc Fixed in 1.15.0-9.el8_10
- tigervnc-icons Fixed in 1.15.0-9.el8_10
- tigervnc-license Fixed in 1.15.0-9.el8_10
- tigervnc-selinux Fixed in 1.15.0-9.el8_10
- tigervnc-server Fixed in 1.15.0-9.el8_10
- tigervnc-server-minimal Fixed in 1.15.0-9.el8_10
- tigervnc-server-module Fixed in 1.15.0-9.el8_10
- xorg-x11-server-Xdmx Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xephyr Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xnest Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xorg Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xvfb Fixed in 1.20.11-28.el8_10
- xorg-x11-server-Xwayland Fixed in 21.1.3-20.el8_10
- xorg-x11-server-common Fixed in 1.20.11-28.el8_10
- xorg-x11-server-devel Fixed in 1.20.11-28.el8_10
- xorg-x11-server-source Fixed in 1.20.11-28.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- tigervnc Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-icons Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-license Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-selinux Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server-minimal Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- tigervnc-server-module Fixed
A version is affected if any line below covers it.
- Affected before 1.15.0-6.el9_7.1
- Affected before 1.15.0-7.el9_8.1
- xorg-x11-server-Xdmx Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xephyr Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xnest Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xorg Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xvfb Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-Xwayland Fixed
A version is affected if any line below covers it.
- Affected before 23.2.7-6.el9_7
- Affected before 24.1.9-4.el9_8
- xorg-x11-server-Xwayland-devel Fixed
A version is affected if any line below covers it.
- Affected before 23.2.7-6.el9_7
- Affected before 24.1.9-4.el9_8
- xorg-x11-server-common Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
- xorg-x11-server-source Fixed
A version is affected if any line below covers it.
- Affected before 1.20.11-33.el9_7
- Affected before 1.20.11-34.el9_8
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- xorg-x11-server-Xwayland Fixed
A version is affected if any line below covers it.
- Affected before 24.1.5-6.el10_1
- Affected before 24.1.9-4.el10_2
- xorg-x11-server-Xwayland-devel Fixed
A version is affected if any line below covers it.
- Affected before 24.1.5-6.el10_1
- Affected before 24.1.9-4.el10_2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- xorg-server Fixed in 2:21.1.7-3+deb12u12
- xwayland No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- xorg-server Fixed in 2:21.1.16-1.3+deb13u2
- xwayland No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- xorg-server Fixed in 2:21.1.22-1
- xwayland Fixed in 2:24.1.10-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- xorg-server No fix yet
- xwayland No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- xorg-server No fix yet
- xwayland No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- xorg-server No fix yet
- xwayland No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- xorg-server No fix yet
- xwayland No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- xorg-server No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- xorg-server No fix yet
- xorg-server-hwe-16.04 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- xorg-server No fix yet
- xorg-server-hwe-18.04 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- xorg-server No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.