{"id":15837,"date":"2026-09-04T19:04:32","date_gmt":"2026-09-04T11:04:32","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-50258"},"modified":"2026-09-04T19:04:32","modified_gmt":"2026-09-04T11:04:32","slug":"cve-2026-50258","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-50258","title":{"rendered":"CVE-2026-50258 [HIGH] &#8211; A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X ser"},"content":{"rendered":"<p>A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15837","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15837","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}