---
cve: "CVE-2026-56003"
severity: "HIGH"
cvss: 8.5
epss: "37%"
vendor: "X.org"
kev: false
exploited: false
published: "2026-07-08 10:16:23"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T23:22:32+02:00"
---

# CVE-2026-56003

> 8.5 HIGH

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- dff957a5158da038a282a59a31fe736702732939 (Commit)

## Referenzen

- <https://www.openwall.com/lists/oss-security/2026/07/08/1>
- <https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56003) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_