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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade freerdp-develUpgrade libwinpr-develUpgrade freerdpUpgrade freerdp-debuginfoUpgrade libwinprUpgrade freerdp-libs | Jun 23, 2026 | Jun 23, 2026 |
| Amazon_linux_2023 | — | Upgrade libwinprUpgrade freerdp-libs-debuginfoUpgrade freerdp-serverUpgrade freerdp-server-debuginfoUpgrade libwinpr-debuginfoUpgrade freerdp-libsUpgrade freerdp-debugsourceUpgrade freerdp-develUpgrade freerdp-debuginfoUpgrade libwinpr-develUpgrade freerdp | Jun 23, 2026 | May 29, 2026 |
| Oracle_linux | — | Upgrade freerdp-serverUpgrade freerdpUpgrade libwinpr-develUpgrade libwinprUpgrade freerdp-develUpgrade freerdp-libs | Oct 22, 2026 | May 29, 2026 |
| Redhat_linux | — | Upgrade freerdp-serverUpgrade libwinpr-develUpgrade freerdpUpgrade freerdp-debugsourceUpgrade freerdp-server-debuginfoUpgrade freerdp-libs-debuginfoNo solution existsUpgrade freerdp-debuginfoUpgrade freerdp-develUpgrade libwinprUpgrade libwinpr-debuginfoUpgrade freerdp-libs | Jul 9, 2026 | May 29, 2026 |
| Rocky_linux | — | Upgrade freerdp-server-debuginfoUpgrade freerdp-debugsourceUpgrade libwinpr-develUpgrade freerdpUpgrade libwinprUpgrade freerdp-debuginfoUpgrade freerdp-develUpgrade freerdp-libsUpgrade freerdp-serverUpgrade libwinpr-debuginfoUpgrade freerdp-libs-debuginfo | Jul 10, 2026 | Jul 8, 2026 |
| Ubuntu | — | Upgrade freerdp3-x11Upgrade freerdp-x11Upgrade libfreerdp3-3 | Jul 21, 2026 | Jul 20, 2026 |
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