CVE-2026-56003

EUVD-2026-42212
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.5 HIGH
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 30.71%
Affected Products (NVD)
VendorProductVersion
xlibxfont
2.0.0 ≤
𝑥
< 2.0.8
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
libxfont
bookworm
vulnerable
bookworm (security)
1:2.0.6-1+deb12u1
fixed
bullseye
vulnerable
bullseye (security)
1:2.0.4-1+deb11u1
fixed
forky
1:2.0.9-1
fixed
sid
1:2.0.9-1
fixed
trixie
vulnerable
trixie (security)
1:2.0.6-1+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libxfont
bionic
Fixed 1:2.0.3-1ubuntu0.1~esm2
released
focal
Fixed 1:2.0.3-1ubuntu0.20.04.1~esm2
released
jammy
Fixed 1:2.0.5-1ubuntu0.2
released
noble
Fixed 1:2.0.6-1+deb13u1build0.24.04.2
released
questing
ignored
resolute
Fixed 1:2.0.6-2ubuntu0.2
released
trusty
Fixed 1:1.4.7-1ubuntu0.4+esm2
released
xenial
Fixed 1:1.5.1-1ubuntu0.16.04.4+esm2
released
libxfont2
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
needs-triage
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
libXfont2-2
suse enterprise desktop 15 SP7
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP4
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP5
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP6
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP7
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP4
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP5
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP6
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP7
2.0.3-150000.3.3.1
fixed
libXfont2-devel
suse enterprise desktop 15 SP7
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP4
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP5
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP6
2.0.3-150000.3.3.1
fixed
suse enterprise sap 15 SP7
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP4
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP5
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP6
2.0.3-150000.3.3.1
fixed
suse enterprise server 15 SP7
2.0.3-150000.3.3.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
libXfont2
RHEL 8
0:2.0.3-2.el8_10.1
fixed
libXfont2-devel
RHEL 8
0:2.0.3-2.el8_10.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
libXfont
Amazon Linux 2
0:1.5.4-1.amzn2.0.1
fixed
libXfont-debuginfo
Amazon Linux 2
0:1.5.4-1.amzn2.0.1
fixed
libXfont-devel
Amazon Linux 2
0:1.5.4-1.amzn2.0.1
fixed
libXfont2
Amazon Linux 2
0:2.0.3-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.0.7-1.amzn2023.0.2
fixed
libXfont2-debuginfo
Amazon Linux 2
0:2.0.3-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.0.7-1.amzn2023.0.2
fixed
libXfont2-debugsource
Amazon Linux 2023
0:2.0.7-1.amzn2023.0.2
fixed
libXfont2-devel
Amazon Linux 2
0:2.0.3-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.0.7-1.amzn2023.0.2
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
libXfont2
Azure Linux 3.0
0:2.0.8-1.azl3
fixed
Common Weakness Enumeration
References
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939
https://www.openwall.com/lists/oss-security/2026/07/08/1