CVE-2026-56003
Publication date 8 July 2026
Last updated 20 July 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libxfont | 26.04 LTS resolute |
Fixed 1:2.0.6-2ubuntu0.2
|
| 24.04 LTS noble |
Fixed 1:2.0.6-1+deb13u1build0.24.04.2
|
|
| 22.04 LTS jammy |
Fixed 1:2.0.5-1ubuntu0.2
|
|
| 20.04 LTS focal |
Fixed 1:2.0.3-1ubuntu0.20.04.1~esm2
|
|
| 18.04 LTS bionic |
Fixed 1:2.0.3-1ubuntu0.1~esm2
|
|
| 16.04 LTS xenial |
Fixed 1:1.5.1-1ubuntu0.16.04.4+esm2
|
|
| 14.04 LTS trusty |
Fixed 1:1.4.7-1ubuntu0.4+esm2
|
|
| libxfont2 | 26.04 LTS resolute | Not in release |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 16.04 LTS xenial |
Needs evaluation
|
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity score breakdown
CVSS version: CVSS v3.0
Base score
8.5 · High
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8560-1
- libXfont vulnerabilities
- 20 July 2026