Packages
- libxfont - X11 font rasterisation library
Details
It was discovered that libXfont incorrectly handled scaling bitmap
fonts, leading to a heap buffer overflow. An attacker able to access
the X server could use this issue to cause libXfont to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2026-56001)
It was discovered that libXfont did not properly check glyph bounds
when reading PCF fonts, leading to a heap buffer overflow. An
authenticated X client could use this issue to cause libXfont to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-56002)
It was discovered that libXfont did not properly check the size of the
property buffer when parsing PCF fonts, leading to a heap buffer
overflow. An authenticated X client could use this issue to cause
libXfont to crash, resulting in a denial of service, or possibly
execute...
It was discovered that libXfont incorrectly handled scaling bitmap
fonts, leading to a heap buffer overflow. An attacker able to access
the X server could use this issue to cause libXfont to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2026-56001)
It was discovered that libXfont did not properly check glyph bounds
when reading PCF fonts, leading to a heap buffer overflow. An
authenticated X client could use this issue to cause libXfont to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-56002)
It was discovered that libXfont did not properly check the size of the
property buffer when parsing PCF fonts, leading to a heap buffer
overflow. An authenticated X client could use this issue to cause
libXfont to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2026-56003)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | libxfont2 – 1:2.0.6-2ubuntu0.2 | ||
| 24.04 LTS noble | libxfont2 – 1:2.0.6-1+deb13u1build0.24.04.2 | ||
| 22.04 LTS jammy | libxfont2 – 1:2.0.5-1ubuntu0.2 | ||
| 20.04 LTS focal | libxfont2 – 1:2.0.3-1ubuntu0.20.04.1~esm2 | ||
| 18.04 LTS bionic | libxfont2 – 1:2.0.3-1ubuntu0.1~esm2 | ||
| 16.04 LTS xenial | libxfont1 – 1:1.5.1-1ubuntu0.16.04.4+esm2 | ||
| 14.04 LTS trusty | libxfont1 – 1:1.4.7-1ubuntu0.4+esm2 | ||
Reduce your security exposure
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