{"id":"CVE-2026-50263","title":"A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow()","summary":"A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-416"],"vendor":"x.org","product":"x_server","affected":["x_server < 21.1.23","xwayland < 24.1.12","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0","enterprise_linux = 10.0"],"patched":["x_server 21.1.23","xwayland 24.1.12"],"published":"2026-06-05","updated":"2026-07-07","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50263","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:26562","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26566","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26590","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26610","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26709","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:28923","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:29844","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:36086","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-50263","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2485388","label":"secalert@redhat.com"},{"url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05","label":"secalert@redhat.com"},{"url":"https://lists.x.org/archives/xorg-announce/2026-June/003702.html","label":"secalert@redhat.com"},{"url":"https://redhat.atlassian.net/browse/PSIRTSUPT-16950","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00141,"epssPercentile":0.03813,"ingestedAt":"2026-07-07T08:52:24.953Z","slug":"CVE-2026-50263","body":"## Overview\n\nA use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.\n\n## Affected\n\n- `x_server < 21.1.23`\n- `xwayland < 24.1.12`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `enterprise_linux = 10.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `x_server 21.1.23`\n- `xwayland 24.1.12`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}