CVE-2026-44421 | FreeRDP is a free implementation of the Remote Desktop Proto… | CVSS 8.8 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-44421
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-06 14:40 UTC
Published: 2026-05-29 19:40 UTC
Last updated: 2026-06-02 03:55 UTC
Primary CWE: CWE-122
CWE-122: Heap-based Buffer Overflow
Vendor / Product: FreeRDP / FreeRDP
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
FreeRDP	FreeRDP	—	< 3.26.0

Weakness (CWE)

CWE	Source	Description
CWE-122	cna	CWE-122: Heap-based Buffer Overflow

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References (1)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff