CVE-2026-56001 PUBLISHED

libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

Assigner: suse
Reserved: 18.06.2026 Published: 08.07.2026 Updated: 08.07.2026

A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 8.5

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	X.Org
Product	libXfont2
Versions	Default: unaffected affected from 0 to 2.0.8 (excl.)

Credits

Anonymous working with Trend Micro Zero Day Initiative. finder

References

https://www.openwall.com/lists/oss-security/2026/07/08/1
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/be0b08e2d354138d3222b4490e2a77c6ee42f778

Problem Types

CWE-122 Heap-based buffer overflow CWE

Impacts

CAPEC-234 Hijacking a privileged process