CVE-2026-44421High· 8.8▾ TwilightFreeRDP 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
0.4% → 0.7%
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.
freerdp < 3.26.0Upgrade past the affected range:
freerdp 3.26.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-40033High· 8.8FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory
CVE-2026-45700Critical· 9.8FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-55191Critical· 9.8FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-44420High· 8.8FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-23534Critical· 9.8FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-23533Critical· 9.8FreeRDP is a free implementation of the Remote Desktop Protocol