{"id":"ALSA-2026:11388","summary":"Important: xorg-x11-server security update","details":"X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.  \n\nSecurity Fix(es):  \n\n  * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999)\n  * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)\n  * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","modified":"2026-04-30T14:30:15.273899Z","published":"2026-04-28T00:00:00Z","related":["CVE-2026-33999","CVE-2026-34001","CVE-2026-34003"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11388"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-33999"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-34001"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-34003"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2451106"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2451109"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2451113"},{"type":"ADVISORY","url":"https://errata.almalinux.org/9/ALSA-2026-11388.html"}],"affected":[{"package":{"name":"xorg-x11-server-Xdmx","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-Xdmx"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-Xephyr","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-Xephyr"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-Xnest","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-Xnest"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-Xorg","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-Xorg"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-Xvfb","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-Xvfb"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-common","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-common"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-devel","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-devel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}},{"package":{"name":"xorg-x11-server-source","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/xorg-x11-server-source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.11-33.el9_7"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:11388.json"}}],"schema_version":"1.7.5"}