What’s Vulnerable › Vulnerabilities

CVE-2026-56001: libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-122

Description

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

Affected products

• X.Org libXfont2: from 2.0.0 before 2.0.8 — fixed in 2.0.8

How to fix

Upgrade to a fixed version: X.Org libXfont2 2.0.8. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2026-56001 or the next vulnerability affects your stack