---
cve: "CVE-2026-44421"
severity: "HIGH"
cvss: 8.8
epss: "51%"
vendor: "FreeRDP"
kev: false
exploited: false
published: "2026-05-29 20:16:24"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T06:33:30+02:00"
---

# CVE-2026-44421

> 8.8 HIGH · 🧪 PoC

## Beschreibung

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 3f6d7cb1f8973cc84c66b258a9a61c4e2b2f30a6 (Commit)

## Referenzen

- <https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff>
- <https://access.redhat.com/errata/RHSA-2026:36203>
- <https://access.redhat.com/errata/RHSA-2026:46393>
- <https://access.redhat.com/security/cve/CVE-2026-44421>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2483471>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44421.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-44421) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_