CVE-2026-56003 · cross-distro fix matrix

CVE-2026-56003: A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

Affects 4 Linux releases across 4 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2026-56003 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

libxfont→ fixed in1:2.0.4-1+deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxfont
```

Debian bookworm

Source: Debian Security Tracker

libxfont→ fixed in1:2.0.6-1+deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxfont
```

Debian trixie

Source: Debian Security Tracker

libxfont→ fixed in1:2.0.6-1+deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxfont
```

Alpine edge

Source: Alpine secdb

libxfont2→ fixed in2.0.8-r0

apk update && apk add --upgrade libxfont2

Are YOU affected by CVE-2026-56003?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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