Debian dla-4678 : libxfont-dev - security update

high Nessus Plugin ID 326438

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4678 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4678-1 [email protected] https://www.debian.org/lts/security/ Andrej Shadura July 12, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : libxfont Version : 1:2.0.4-1+deb11u1 1:2.0.6-1+deb12u1 CVE ID : CVE-2026-56001 CVE-2026-56002 CVE-2026-56003

A series of heap overflows in bitmap/PCF parser code could be used by authenticated attackers to execute code in the X server context.

CVE-2026-56001

A heap buffer overflow in BitmapScaleBitmaps in due to an overflowing 32-bit size.

CVE-2026-56002

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking.

CVE-2026-56003

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in ComputeScaledProperties().

For Debian 11 bullseye, these problems have been fixed in version 1:2.0.4-1+deb11u1.

For Debian 12 bookworm, these problems have been fixed in version 1:2.0.6-1+deb12u1.

We recommend that you upgrade your libxfont packages.

For the detailed security status of libxfont please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libxfont

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libxfont-dev packages.

Plugin Details

Severity: High

ID: 326438

File Name: debian_DLA-4678.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 7/13/2026

Updated: 7/13/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.14

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-56003

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libxfont2, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libxfont2-udeb, p-cpe:/a:debian:debian_linux:libxfont-dev, cpe:/o:debian:debian_linux:12.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 7/12/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-56001, CVE-2026-56002, CVE-2026-56003

Detections

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