# RHSA-2026:20563: xorg-x11-server-Xwayland security update

RHSA-2026:20563, released April 30, 2026, fixes 5 CVEs in xorg-x11-server-Xwayland (version 24.1.5-6.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-20563
- Platform: Linux
- Released: Apr 30, 2026
- Priority: Urgent (Closes CVE-2026-34002, rated Critical)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:20563

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [xorg-x11-server-Xwayland](https://patchblox.com/security/data/product/linux/xorg-x11-server-xwayland.md) | RHEL 10 | 24.1.5-6.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-34000](https://patchblox.com/security/data/cve/CVE-2026-34000.md) | Urgent | xorg-server: A flaw was found in the X.Org X server | 9.1 | 0.0049 |  |
| [CVE-2026-34002](https://patchblox.com/security/data/cve/CVE-2026-34002.md) | Urgent | xorg-x11-server: This update for xorg-x11-server fixes the following issues:  - CVE-2026-33999: XKB integer underflow in XkbSetCompatM... | 9.1 | 0.0049 |  |
| [CVE-2026-33999](https://patchblox.com/security/data/cve/CVE-2026-33999.md) | High | Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling | 7.8 | 0.0038 |  |
| [CVE-2026-34001](https://patchblox.com/security/data/cve/CVE-2026-34001.md) | High | xorg-x11-server-common: X.Org is an open-source implementation of the X Window System | 7.8 | 0.0026 |  |
| [CVE-2026-34003](https://patchblox.com/security/data/cve/CVE-2026-34003.md) | High | xorg-x11-server-common: X.Org is an open-source implementation of the X Window System | 7.8 | 0.0025 |  |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo