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xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing

🗓️ 03 Aug 2026 02:54:40Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 8 Views

Stack buffer overflow in X.Org X server and Xwayland via XKB SetMap indexing; may crash or escalate privileges.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
freebsd
FreeBSD		xwayland -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
freebsd
FreeBSD		xorg-server -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
attackerkb
ATTACKERKB		CVE-2026-50259
5 Jun 202610:31
–attackerkb
nessus
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-Xwayland, xorg-x11-server-Xwayland-devel (ALAS2023-2026-1789)
8 Jun 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2023 : xorg-x11-server-common, xorg-x11-server-devel, xorg-x11-server-source (ALAS2023-2026-1790)
8 Jun 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2023 : tigervnc, tigervnc-icons, tigervnc-license (ALAS2023-2026-1892)
22 Jun 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2 : xorg-x11-server, --advisory ALAS2-2026-3336 (ALAS-2026-3336)
8 Jun 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2 : tigervnc, --advisory ALAS2-2026-3792 (ALAS-2026-3792)
8 Jul 202600:00
–nessus
nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0166: xorg-x11-server (ALINUX3-SA-2026:0166)
1 Jul 202600:00
–nessus
nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0177: tigervnc (ALINUX3-SA-2026:0177)
1 Jul 202600:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux6.10i686tigervnc1.1.0-25.el6_10.18tigervnc-1.1.0-25.el6_10.18.i686.rpm
Red Hat Enterprise Linux6.10s390xtigervnc1.1.0-25.el6_10.18tigervnc-1.1.0-25.el6_10.18.s390x.rpm
Red Hat Enterprise Linux6.10x86_64tigervnc1.1.0-25.el6_10.18tigervnc-1.1.0-25.el6_10.18.x86_64.rpm
Red Hat Enterprise Linux6.10i686tigervnc-debuginfo1.1.0-25.el6_10.18tigervnc-debuginfo-1.1.0-25.el6_10.18.i686.rpm
Red Hat Enterprise Linux6.10s390xtigervnc-debuginfo1.1.0-25.el6_10.18tigervnc-debuginfo-1.1.0-25.el6_10.18.s390x.rpm
Red Hat Enterprise Linux6.10x86_64tigervnc-debuginfo1.1.0-25.el6_10.18tigervnc-debuginfo-1.1.0-25.el6_10.18.x86_64.rpm
Red Hat Enterprise Linux6.10i686tigervnc-server1.1.0-25.el6_10.18tigervnc-server-1.1.0-25.el6_10.18.i686.rpm
Red Hat Enterprise Linux6.10s390xtigervnc-server1.1.0-25.el6_10.18tigervnc-server-1.1.0-25.el6_10.18.s390x.rpm
Red Hat Enterprise Linux6.10x86_64tigervnc-server1.1.0-25.el6_10.18tigervnc-server-1.1.0-25.el6_10.18.x86_64.rpm
Red Hat Enterprise Linux6.10noarchtigervnc-server-applet1.1.0-25.el6_10.18tigervnc-server-applet-1.1.0-25.el6_10.18.noarch.rpm
Rows per page

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04 Aug 2026 23:22Current
7.7High risk
Vulners AI Score7.7
CVSS 3.17.8
EPSS0.00165
SSVC
CWE-121
X serverXwaylandXKB SetMapstack overflowmapWidthsprivilege escalationroot accessbuffer overflow
8