CVE-2026-44421

8.8 HIGH

FreeRDP is a free implementation of the Remote Desktop Protocol

Published: 2026-05-29 · Last updated: 2026-06-01

Severity and scoring

CVSS: 8.8 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-122

Affected products

Vendor	Product
freerdp	freerdp

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-44421
[Vendor advisory]https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff
[Vendor advisory]https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff

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CVE-2026-45700 — FreeRDP is a free implementation of the Remote Desktop Protocol (9.8 CRITICAL)
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CVE-2026-44420 — FreeRDP is a free implementation of the Remote Desktop Protocol (8.8 HIGH)
CVE-2026-40033 — FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bo... (8.8 HIGH)

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