Integer overflow in libxfont2 - CVE-2026-56001
Published: July 20, 2026
Vulnerability identifier: #VU138427
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-56001
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: xorg.freedesktop.org
Affected software:
libxfont2
libxfont2
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the target system.
The vulnerability exists due to integer overflow within the BitmapScaleBitmaps function. A local user can pass specially crafted data to the application, trigger integer overflow and gain elevated privileges on the target system.
How to mitigate CVE-2026-56001
Install updates from vendor's website.