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CVE-2026-33999— Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

CVSS 7.8 · High EPSS 0.01% · P2
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I. Basic Information for CVE-2026-33999

Vulnerability Information
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Vulnerability Title
Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
Vulnerability Title
X.Org X Server 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
X.Org X Server是X.Org基金会的一款X Window系统显示服务器。 X.Org X Server存在数字错误漏洞，该漏洞源于XKB兼容映射处理中的整数下溢，可能导致攻击者触发缓冲区读取溢出，进而导致内存安全违规和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 10 0:24.1.5-6.el10_1 ~ * cpe:/o:redhat:enterprise_linux:10.1
Red HatRed Hat Enterprise Linux 8 0:21.1.3-20.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 8 0:1.20.11-28.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 8 0:1.15.0-9.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 9 0:1.15.0-6.el9_7.1 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Enterprise Linux 9 0:23.2.7-6.el9_7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Enterprise Linux 9 0:1.20.11-33.el9_7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7

II. Public POCs for CVE-2026-33999

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III. Intelligence Information for CVE-2026-33999

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Same Patch Batch · Red Hat · 2026-04-23 · 6 CVEs total

CVE-2026-340037.8 HIGHXorg: xwayland: x.org x server: information exposure and denial of service via out-of-boun
CVE-2026-340017.8 HIGHXorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and pot
CVE-2026-67326.5 MEDIUMLibxml2: libxml2: denial of service via crafted xsd-validated document
CVE-2025-662864.7 MEDIUMWebkitgtk: authorization bypass through webpage::send-request signal handler
CVE-2026-27083.7 LOWLibsoup: libsoup: http request smuggling via duplicate content-length headers

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-191

V. Comments for CVE-2026-33999

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