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The vulnerability of the CheckModifierMap() function in the XKB component of the Wayland protocol implementation for X.Org XWaylan, as well as in the X.Org Server implementation of the X Window System, allows a malicious actor to trigger a service failure.

🗓️ 27 Apr 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 1 Views

CheckModifierMap in XKB for Wayland and X.Org Server may read beyond buffer, causing service failure.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD		xwayland -- Multiple vulnerabilities
14 Apr 202600:00
–freebsd
FreeBSD		xorg-server -- Multiple vulnerabilities
14 Apr 202600:00
–freebsd
ATTACKERKB		CVE-2026-34002
5 May 202614:41
–attackerkb
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-Xwayland, xorg-x11-server-Xwayland-devel (ALAS2023-2026-1613)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-common, xorg-x11-server-devel, xorg-x11-server-source (ALAS2023-2026-1614)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : tigervnc, tigervnc-icons, tigervnc-license (ALAS2023-2026-1626)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : xorg-x11-server, --advisory ALAS2-2026-3268 (ALAS-2026-3268)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : tigervnc, --advisory ALAS2-2026-3273 (ALAS-2026-3273)
30 Apr 202600:00
–nessus
Tenable Nessus		Fedora 42 : xorg-x11-server-Xwayland (2026-0174d1953a)
7 May 202600:00
–nessus
Tenable Nessus		Fedora 42 : tigervnc (2026-0b633ecc7c)
27 Apr 202600:00
–nessus
Rows per page
Vulners
Node
x.orgx.org_serverRange<21.1.22

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19 Jun 2026 00:00Current
6.5Medium risk
Vulners AI Score6.5
CVSS 25.2
CVSS 36.1
EPSS0.00489
modifier map checkbuffer overreadwayland protocolx window system
1