CVE-2026-50256

216.73.217.64

· Published 05/06/2026 12:16 · Modified 05/06/2026 13:27

Labels: CVE-2026-50256 2026-06-05 CVE-2026-50256 CWE-121 [email protected]

Essential information

Published: 05/06/2026 12:16
Modified: 05/06/2026 13:27
Author: —
Creator: —
CVSS: 7.8 HIGH (v3.1)
CISA KEV: No
CWE: —
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS metrics

Description

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.

NVD status

Status: Undergoing Analysis — CVE has been recently published to the CVE List and has been received by the NVD.
Source: [email protected]
NVD: View on NVD

Affected products (CPE)

Product	CPE
x.org / x server	`cpe:2.3:a:x.org:x_server::::::::`
x.org / xwayland	`cpe:2.3:a:x.org:xwayland::::::::`
freedesktop / libxfont2	`cpe:2.3:a:freedesktop:libxfont2::::::::`