{"schema_version":1,"title":"X.Org Foundation vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 12 vulnerabilities in X.Org Foundation: 1 in the last 7 days and 1 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-88807, was published on 21 September 2026. 2 technologies have a page of their own.","url":"https://junglewise.ai/threats/vendors/x-org-foundation","json_url":"https://junglewise.ai/threats/vendors/x-org-foundation.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/vendors/x-org-foundation","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"vendor","counts":{"high":9,"all_time":12,"critical":2,"exploited":0,"last_7_days":1,"last_30_days":1,"last_90_days":1,"last_365_days":9},"latest":[{"cve":"CVE-2026-88807","epss":0.0033,"slug":"cve-2026-88807-a-heap-overflow-in-libxrender-before-0-9-13-in","title":"libXrender heap overflow in RenderQueryPictFormats","severity":"info","exploited":false,"published_at":"2026-09-21T14:17:22.41+00:00","url":"https://junglewise.ai/threats/cve-2026-88807-a-heap-overflow-in-libxrender-before-0-9-13-in"},{"cve":"CVE-2026-50264","cvss":7.8,"slug":"cve-2026-50264-x-org-x-server-and-xwayland-out-of-bounds-write-in-dri2","title":"X.Org X server and Xwayland out-of-bounds write in DRI2","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:40.08+00:00","url":"https://junglewise.ai/threats/cve-2026-50264-x-org-x-server-and-xwayland-out-of-bounds-write-in-dri2"},{"cve":"CVE-2026-50261","cvss":7.8,"slug":"cve-2026-50261-x-org-x-server-use-after-free-in-syncchangecounter","title":"X.Org X server use-after-free in SyncChangeCounter","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.617+00:00","url":"https://junglewise.ai/threats/cve-2026-50261-x-org-x-server-use-after-free-in-syncchangecounter"},{"cve":"CVE-2026-50260","cvss":7.8,"slug":"cve-2026-50260-x-org-x-server-and-xwayland-use-after-free-in-freecounter","title":"X.Org X server and Xwayland use-after-free in FreeCounter","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.43+00:00","url":"https://junglewise.ai/threats/cve-2026-50260-x-org-x-server-and-xwayland-use-after-free-in-freecounter"},{"cve":"CVE-2026-50259","cvss":7.8,"slug":"cve-2026-50259-x-org-x-server-stack-buffer-overflow-in-xkb-setmap-request","title":"X.Org X server stack buffer overflow in XKB SetMap request","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.24+00:00","url":"https://junglewise.ai/threats/cve-2026-50259-x-org-x-server-stack-buffer-overflow-in-xkb-setmap-request"},{"cve":"CVE-2026-34003","cvss":7.8,"epss":0.0001,"slug":"cve-2026-34003-x-org-x-server-out-of-bounds-memory-access-in-xkb-request","title":"X.Org X server out-of-bounds memory access in XKB request validation","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.92+00:00","url":"https://junglewise.ai/threats/cve-2026-34003-x-org-x-server-out-of-bounds-memory-access-in-xkb-request"},{"cve":"CVE-2026-34001","cvss":7.8,"epss":0.0001,"slug":"cve-2026-34001-x-org-x-server-use-after-free-in-misynctriggerfence","title":"X.Org X server use-after-free in miSyncTriggerFence","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.777+00:00","url":"https://junglewise.ai/threats/cve-2026-34001-x-org-x-server-use-after-free-in-misynctriggerfence"},{"cve":"CVE-2026-33999","cvss":7.8,"epss":0.0001,"slug":"cve-2026-33999-x-org-x-server-integer-underflow-in-xkb-compatibility-map","title":"X.Org X server integer underflow in XKB compatibility map handling","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.623+00:00","url":"https://junglewise.ai/threats/cve-2026-33999-x-org-x-server-integer-underflow-in-xkb-compatibility-map"},{"cve":"CVE-2025-62230","cvss":7.3,"epss":0.0026,"slug":"cve-2025-62230-x-org-x-server-use-after-free-in-xkb-client-resource-removal","title":"X.Org X server use-after-free in Xkb client resource removal","severity":"high","exploited":false,"published_at":"2025-10-30T06:15:45.593+00:00","url":"https://junglewise.ai/threats/cve-2025-62230-x-org-x-server-use-after-free-in-xkb-client-resource-removal"},{"cve":"CVE-1999-0526","cvss":10,"slug":"cve-1999-0526-x-org-x-server-access-control-bypass-via-insecure-xhost","title":"X.Org X Server access control bypass via insecure xhost configuration","severity":"critical","exploited":false,"published_at":"1997-07-01T04:00:00+00:00","url":"https://junglewise.ai/threats/cve-1999-0526-x-org-x-server-access-control-bypass-via-insecure-xhost"},{"cve":"CVE-1999-0040","cvss":7.2,"slug":"cve-1999-0040-x-windowing-system-xt-library-buffer-overflow","title":"X Windowing System Xt library buffer overflow","severity":"high","exploited":false,"published_at":"1997-05-01T04:00:00+00:00","url":"https://junglewise.ai/threats/cve-1999-0040-x-windowing-system-xt-library-buffer-overflow"},{"cve":"CVE-1999-0241","cvss":10,"slug":"cve-1999-0241-x-window-system-guessable-magic-cookies-remote-command-execution","title":"X Window System guessable magic cookies remote command execution","severity":"critical","exploited":false,"published_at":"1995-11-01T05:00:00+00:00","url":"https://junglewise.ai/threats/cve-1999-0241-x-window-system-guessable-magic-cookies-remote-command-execution"}],"vendor":{"hub":true,"name":"X.Org Foundation","slug":"x-org-foundation","homepage":"https://www.x.org/","description":"The X.Org Foundation provides an open source implementation of the X Window System.","url":"https://junglewise.ai/threats/vendors/x-org-foundation"},"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":1}],"most_severe":[{"cve":"CVE-1999-0526","cvss":10,"slug":"cve-1999-0526-x-org-x-server-access-control-bypass-via-insecure-xhost","title":"X.Org X Server access control bypass via insecure xhost configuration","severity":"critical","exploited":false,"published_at":"1997-07-01T04:00:00+00:00","url":"https://junglewise.ai/threats/cve-1999-0526-x-org-x-server-access-control-bypass-via-insecure-xhost"},{"cve":"CVE-1999-0241","cvss":10,"slug":"cve-1999-0241-x-window-system-guessable-magic-cookies-remote-command-execution","title":"X Window System guessable magic cookies remote command execution","severity":"critical","exploited":false,"published_at":"1995-11-01T05:00:00+00:00","url":"https://junglewise.ai/threats/cve-1999-0241-x-window-system-guessable-magic-cookies-remote-command-execution"},{"cve":"CVE-2026-34003","cvss":7.8,"epss":0.0001,"slug":"cve-2026-34003-x-org-x-server-out-of-bounds-memory-access-in-xkb-request","title":"X.Org X server out-of-bounds memory access in XKB request validation","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.92+00:00","url":"https://junglewise.ai/threats/cve-2026-34003-x-org-x-server-out-of-bounds-memory-access-in-xkb-request"},{"cve":"CVE-2026-34001","cvss":7.8,"epss":0.0001,"slug":"cve-2026-34001-x-org-x-server-use-after-free-in-misynctriggerfence","title":"X.Org X server use-after-free in miSyncTriggerFence","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.777+00:00","url":"https://junglewise.ai/threats/cve-2026-34001-x-org-x-server-use-after-free-in-misynctriggerfence"},{"cve":"CVE-2026-33999","cvss":7.8,"epss":0.0001,"slug":"cve-2026-33999-x-org-x-server-integer-underflow-in-xkb-compatibility-map","title":"X.Org X server integer underflow in XKB compatibility map handling","severity":"high","exploited":false,"published_at":"2026-04-23T16:16:24.623+00:00","url":"https://junglewise.ai/threats/cve-2026-33999-x-org-x-server-integer-underflow-in-xkb-compatibility-map"},{"cve":"CVE-2026-50264","cvss":7.8,"slug":"cve-2026-50264-x-org-x-server-and-xwayland-out-of-bounds-write-in-dri2","title":"X.Org X server and Xwayland out-of-bounds write in DRI2","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:40.08+00:00","url":"https://junglewise.ai/threats/cve-2026-50264-x-org-x-server-and-xwayland-out-of-bounds-write-in-dri2"},{"cve":"CVE-2026-50261","cvss":7.8,"slug":"cve-2026-50261-x-org-x-server-use-after-free-in-syncchangecounter","title":"X.Org X server use-after-free in SyncChangeCounter","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.617+00:00","url":"https://junglewise.ai/threats/cve-2026-50261-x-org-x-server-use-after-free-in-syncchangecounter"},{"cve":"CVE-2026-50260","cvss":7.8,"slug":"cve-2026-50260-x-org-x-server-and-xwayland-use-after-free-in-freecounter","title":"X.Org X server and Xwayland use-after-free in FreeCounter","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.43+00:00","url":"https://junglewise.ai/threats/cve-2026-50260-x-org-x-server-and-xwayland-use-after-free-in-freecounter"},{"cve":"CVE-2026-50259","cvss":7.8,"slug":"cve-2026-50259-x-org-x-server-stack-buffer-overflow-in-xkb-setmap-request","title":"X.Org X server stack buffer overflow in XKB SetMap request","severity":"high","exploited":false,"published_at":"2026-06-05T12:16:39.24+00:00","url":"https://junglewise.ai/threats/cve-2026-50259-x-org-x-server-stack-buffer-overflow-in-xkb-setmap-request"},{"cve":"CVE-2025-62230","cvss":7.3,"epss":0.0026,"slug":"cve-2025-62230-x-org-x-server-use-after-free-in-xkb-client-resource-removal","title":"X.Org X server use-after-free in Xkb client resource removal","severity":"high","exploited":false,"published_at":"2025-10-30T06:15:45.593+00:00","url":"https://junglewise.ai/threats/cve-2025-62230-x-org-x-server-use-after-free-in-xkb-client-resource-removal"}],"generated_at":"2026-09-26T12:07:00.15149+00:00","technologies":[{"name":"X.Org Foundation X.Org Server","slug":"x-server","vulnerabilities":9,"url":"https://junglewise.ai/threats/technologies/x-server"},{"name":"X.Org Foundation Xwayland","slug":"xwayland","vulnerabilities":6,"url":"https://junglewise.ai/threats/technologies/xwayland"}]}