libXfont2 computeProps Property Buffer Heap Buffer Overflow
CVE-2026-56003 is fixed in 6 products on 1 platform, first by libxfont2 1:2.0.6-2ubuntu0.2, released July 8, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libXfont2 · RHEL 10 | 2.0.6-5.el10_0.1 | RHSA-2026:51061 | Jul 31, 2026 |
| libXfont2 · RHEL 8 | 0:2.0.3-2.el8_10.1 | RHSA-2026:47103 | Jul 31, 2026 |
| libXfont2 · RHEL 9 | 0:2.0.3-12.el9_8.1 | RHSA-2026:47084 | Aug 5, 2026 |
| libXfont2 · almalinux 10 | 2.0.6-5.el10_2.1 | ALSA-2026:47079 | Jul 28, 2026 |
| libXfont2 · almalinux 8 | 2.0.3-2.el8_10.1 | ALSA-2026:47103 | Jul 28, 2026 |
| libXfont2 · almalinux 9 | 2.0.3-12.el9_8.1 | ALSA-2026:47084 | Jul 28, 2026 |
| libXfont2 · amzn 2023 | 2.0.7-1.amzn2023.0.2 | ALAS2023-2026-1967 | Jul 20, 2026 |
| libXfont2 · ol 8 | 0:2.0.3-2.el8_10.1 | ELSA-2026-47103 | Jul 28, 2026 |
| libXfont2 · opensuse-leap 16.0 | 2.0.7-160000.4.1 | OPENSUSE-SU-2026:21284-1 | Jul 10, 2026 |
| libXfont2 · rocky 8 | 0:2.0.3-2.el8_10.1 | RLSA-2026:47103 | Jul 29, 2026 |
| libXfont2 · sles 15.6 | 2.0.3-150000.3.3.1 | SUSE-SU-2026:2794-1 | Jul 8, 2026 |
| libXfont2 · sles 15.7 | 2.0.3-150000.3.3.1 | SUSE-SU-2026:2794-1 | Jul 8, 2026 |
| libXfont2 · sles 16.0 | 2.0.7-160000.4.1 | SUSE-SU-2026:22614-1 | Jul 10, 2026 |
| libXfont2-debuginfo · amzn 2023 | 2.0.7-1.amzn2023.0.2 | ALAS2023-2026-1967 | Jul 20, 2026 |
| libXfont2-debugsource · amzn 2023 | 2.0.7-1.amzn2023.0.2 | ALAS2023-2026-1967 | Jul 20, 2026 |
| libXfont2-devel · RHEL 8 | 0:2.0.3-2.el8_10.1 | RHSA-2026:47103 | Jul 31, 2026 |
| libXfont2-devel · RHEL 9 | 0:2.0.3-12.el9_8.1 | RHSA-2026:47084 | Aug 5, 2026 |
| libXfont2-devel · almalinux 10 | 2.0.6-5.el10_2.1 | ALSA-2026:47079 | Jul 28, 2026 |
| libXfont2-devel · almalinux 8 | 2.0.3-2.el8_10.1 | ALSA-2026:47103 | Jul 28, 2026 |
| libXfont2-devel · almalinux 9 | 2.0.3-12.el9_8.1 | ALSA-2026:47084 | Jul 28, 2026 |
| libXfont2-devel · amzn 2023 | 2.0.7-1.amzn2023.0.2 | ALAS2023-2026-1967 | Jul 20, 2026 |
| libXfont2-devel · ol 8 | 0:2.0.3-2.el8_10.1 | ELSA-2026-47103 | Jul 28, 2026 |
| libxfont · Debian 12.15 (bookworm) | 1:2.0.6-1+deb12u1 | DEBIAN-CVE-2026-56003 | Jul 13, 2026 |
| libxfont · Debian 13.5 (trixie) | 1:2.0.6-1+deb13u1 | DEBIAN-CVE-2026-56003 | Jul 13, 2026 |
| libxfont · Debian 14 | 1:2.0.8-1 | DEBIAN-CVE-2026-56003 | Jul 13, 2026 |
| libxfont2 · Ubuntu 18.04.6 LTS (bionic) | 1:2.0.3-1ubuntu0.1~esm2 | libxfont2 1:2.0.3-1ubuntu0.1~esm2 | Jul 23, 2026 |
| libxfont2 · Ubuntu 20.04 LTS (focal) | 1:2.0.3-1ubuntu0.20.04.1~esm2 | libxfont2 1:2.0.3-1ubuntu0.20.04.1~esm2 | Jul 23, 2026 |
| libxfont2 · Ubuntu 22.04.1 LTS (jammy) | 1:2.0.5-1ubuntu0.2 | libxfont2 1:2.0.5-1ubuntu0.2 | Jul 23, 2026 |
| libxfont2 · Ubuntu 24.04.5 LTS (noble) | 1:2.0.6-1+deb13u1build0.24.04.2 | libxfont2 1:2.0.6-1+deb13u1build0.24.04.2 | Jul 23, 2026 |
| libxfont2 · Ubuntu 26.04.1 LTS (resolute) | 1:2.0.6-2ubuntu0.2 | libxfont2 1:2.0.6-2ubuntu0.2 | Jul 8, 2026 |
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