{"schema_version": "1.7.0", "id": "RLSA-2026:11388", "modified": "2026-04-30T12:08:50.971177Z", "published": "2026-04-30T12:03:33.126838Z", "upstream": ["CVE-2026-33999", "CVE-2026-34001", "CVE-2026-34003"], "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\n* xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001)\n\n* xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003)\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.", "severity": [{"type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}], "affected": [{"package": {"ecosystem": "Rocky Linux:9", "name": "xorg-x11-server", "purl": "pkg:rpm/rocky-linux/xorg-x11-server?distro=rocky-linux-9&epoch=0"}, "ranges": [{"type": "ECOSYSTEM", "events": [{"introduced": "0"}, {"fixed": "0:1.20.11-33.el9_7"}], "database_specific": {"yum_repository": "AppStream"}}]}], "references": [{"type": "ADVISORY", "url": "https://errata.rockylinux.org/RLSA-2026:11388"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451106"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451109"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451113"}], "credits": [{"name": "Rocky Enterprise Software Foundation"}, {"name": "Red Hat"}]}