Vulnerability · Published Jul 8, 2026 · Assigned by suse
CVE-2026-56003libXfont2 computeProps Property Buffer Heap Buffer Overflow
High 8.5
In plain English
A high-severity heap buffer overflow in libXfont2 from X.Org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.4%top 65.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | libXfont2 | 2.0.6-5.el10_2.1 | ALSA-2026:47079 |
| AlmaLinux:8 | libXfont2 | 2.0.3-2.el8_10.1 | ALSA-2026:47103 |
| AlmaLinux:9 | libXfont2 | 2.0.3-12.el9_8.1 | ALSA-2026:47084 |
| AlmaLinux:10 | libXfont2-devel | 2.0.6-5.el10_2.1 | ALSA-2026:47079 |
| AlmaLinux:8 | libXfont2-devel | 2.0.3-2.el8_10.1 | ALSA-2026:47103 |
| AlmaLinux:9 | libXfont2-devel | 2.0.3-12.el9_8.1 | ALSA-2026:47084 |
| Alpine:v3.24 | libxfont2 | 2.0.8-r0 | ALPINE-CVE-2026-56003 |
| Debian:12 | libxfont | 1:2.0.6-1+deb12u1 | DEBIAN-CVE-2026-56003 |
| Debian:13 | libxfont | 1:2.0.6-1+deb13u1 | DEBIAN-CVE-2026-56003 |
| Debian:14 | libxfont | 1:2.0.8-1 | DEBIAN-CVE-2026-56003 |
| Rocky Linux:8 | libXfont2 | 0:2.0.3-2.el8_10.1 | RLSA-2026:47103 |
| Ubuntu:22.04:LTS | libxfont | 1:2.0.5-1ubuntu0.2 | USN-8560-1 |
| Ubuntu:22.04:LTS | libxfont | 1:2.0.5-1ubuntu0.2 | UBUNTU-CVE-2026-56003 |
| Ubuntu:24.04:LTS | libxfont | 1:2.0.6-1+deb13u1build0.24.04.2 | UBUNTU-CVE-2026-56003 |
| Ubuntu:24.04:LTS | libxfont | 1:2.0.6-1+deb13u1build0.24.04.2 | USN-8560-1 |
| Ubuntu:25.10 | libxfont | no fix listed | UBUNTU-CVE-2026-56003 |
| Ubuntu:26.04:LTS | libxfont | 1:2.0.6-2ubuntu0.2 | UBUNTU-CVE-2026-56003 |
| Ubuntu:26.04:LTS | libxfont | 1:2.0.6-2ubuntu0.2 | USN-8560-1 |
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H