{"id":"AZL-89546","summary":"CVE-2026-50259 affecting package xorg-x11-server 1.20.10-6","details":"A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.","modified":"2026-09-02T05:29:58Z","published":"2026-06-05T12:16:39Z","upstream":["CVE-2026-50259"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50259"}],"affected":[{"package":{"name":"xorg-x11-server","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/xorg-x11-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.20.10-6"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-89546.json"}}],"schema_version":"1.9.0"}