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

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

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/23/2026 - 20:20
CVE ID :CVE-2026-33999
Published : April 23, 2026, 4:16 p.m. | 1 hour, 56 minutes ago
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.
Severity: 7.8 | HIGH
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.