{"id":"UBUNTU-CVE-2026-88806","details":"A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.","modified":"2026-09-23T23:36:46Z","published":"2026-09-21T14:17:00Z","upstream":["CVE-2026-88806"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-88806"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-88806"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309"}],"affected":[{"package":{"name":"libx11","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.6.1-1ubuntu1","2:1.6.1-1ubuntu2","2:1.6.2-1ubuntu1","2:1.6.2-1ubuntu2","2:1.6.2-1ubuntu2.1","2:1.6.2-1ubuntu2.1+esm1","2:1.6.2-1ubuntu2.1+esm2","2:1.6.2-1ubuntu2.1+esm3","2:1.6.2-1ubuntu2.1+esm4","2:1.6.2-1ubuntu2.1+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.2-1ubuntu2.1+esm5","binary_name":"libx11-6"},{"binary_version":"2:1.6.2-1ubuntu2.1+esm5","binary_name":"libx11-data"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.2-1ubuntu2.1+esm5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.6.3-1ubuntu2","2:1.6.3-1ubuntu2.1","2:1.6.3-1ubuntu2.2","2:1.6.3-1ubuntu2.2+esm1","2:1.6.3-1ubuntu2.2+esm2","2:1.6.3-1ubuntu2.2+esm3","2:1.6.3-1ubuntu2.2+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.3-1ubuntu2.2+esm4","binary_name":"libx11-6"},{"binary_name":"libx11-data","binary_version":"2:1.6.3-1ubuntu2.2+esm4"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.3-1ubuntu2.2+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.6.4-3","2:1.6.4-3ubuntu0.1","2:1.6.4-3ubuntu0.2","2:1.6.4-3ubuntu0.3","2:1.6.4-3ubuntu0.4","2:1.6.4-3ubuntu0.4+esm1","2:1.6.4-3ubuntu0.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libx11-6","binary_version":"2:1.6.4-3ubuntu0.4+esm2"},{"binary_name":"libx11-data","binary_version":"2:1.6.4-3ubuntu0.4+esm2"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.4-3ubuntu0.4+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.6.8-1","2:1.6.9-2","2:1.6.9-2ubuntu1","2:1.6.9-2ubuntu1.1","2:1.6.9-2ubuntu1.2","2:1.6.9-2ubuntu1.5","2:1.6.9-2ubuntu1.6"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.9-2ubuntu1.6","binary_name":"libx11-6"},{"binary_version":"2:1.6.9-2ubuntu1.6","binary_name":"libx11-data"},{"binary_version":"2:1.6.9-2ubuntu1.6","binary_name":"libx11-xcb1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.7.2-1","2:1.7.2-2","2:1.7.2-2build1","2:1.7.5-1","2:1.7.5-1ubuntu0.2","2:1.7.5-1ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_name":"libx11-6","binary_version":"2:1.7.5-1ubuntu0.3"},{"binary_name":"libx11-data","binary_version":"2:1.7.5-1ubuntu0.3"},{"binary_name":"libx11-xcb1","binary_version":"2:1.7.5-1ubuntu0.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.8.6-1ubuntu1","2:1.8.7-1","2:1.8.7-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libx11-6","binary_version":"2:1.8.7-1build1"},{"binary_name":"libx11-data","binary_version":"2:1.8.7-1build1"},{"binary_version":"2:1.8.7-1build1","binary_name":"libx11-xcb1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libx11?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:1.8.12-1build1","2:1.8.12-1build2","2:1.8.13-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libx11-6","binary_version":"2:1.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