---
cve: "CVE-2026-55648"
severity: "MEDIUM"
cvss: 6.1
epss: "55%"
vendor: "FreeRDP"
kev: false
exploited: false
published: "2026-08-19 18:16:45"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:49:15+02:00"
---

# CVE-2026-55648

> 6.1 MEDIUM · 🧪 PoC

## Beschreibung

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon_data in libfreerdp/codec/color.c calculates nWidth multiplied by nHeight multiplied by FreeRDPGetBytesPerPixel(format) in 32-bit arithmetic. A malicious RDP server can send a RAIL TS_ICON_INFO update with dimensions such as 32768 by 32768 and 32 bits per pixel so the required-size calculation wraps, bypassing the cbBitsColor source bounds check before freerdp_image_copy_no_overlap reads attacker-controlled icon data. This affects RemoteApp clients using the vulnerable library path, while xfreerdp has a caller-side mitigation. This issue is fixed in version 3.27.0.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- e4ae473da2926724d9b6329778797a3bdea79eb3 (Commit)
- 4f72b0979892352ff501e84d99832dc3bdc86a53 (Commit)

## Referenzen

- <https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5c5v-f78v-h2f6>
- <https://github.com/FreeRDP/FreeRDP/pull/12877>
- <https://github.com/FreeRDP/FreeRDP/commit/e4ae473da2926724d9b6329778797a3bdea79eb3>
- <https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55648) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_