FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP H.264 decoder backends can return YUV planes sized from the bitstream without comparing the decoded width and height to the RDPGFX surface dimensions used to validate region rectangles. A malicious RDP server can provide an AVC420 or AVC444 bitstream whose decoded frame is smaller than the negotiated surface, causing yuv420_context_decode and the YUV-to-RGB conversion paths to read beyond the decoder-owned planes in libfreerdp/codec/h264.c and the selected H.264 backend. This can disclose client memory or crash the client. This issue is fixed in version 3.27.0.
CVSS Details
- CVSS 4.0 Base Score: 7.2 (HIGH)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
- CVSS 3.1 Base Score: 8.2
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade freerdp | Aug 20, 2026 | Aug 19, 2026 |
| Redhat_linux | — | Upgrade libwinpr-debuginfoUpgrade freerdp-serverUpgrade freerdp-libs-debuginfoUpgrade freerdp-debugsourceUpgrade freerdp-libsUpgrade freerdp-develUpgrade freerdp-debuginfoUpgrade libwinprUpgrade freerdp-server-debuginfoUpgrade libwinpr-develUpgrade freerdp | Aug 24, 2026 | Aug 19, 2026 |
| Ubuntu | — | Upgrade freerdp-x11Upgrade freerdp3-x11Upgrade libfreerdp3-3 | Jul 21, 2026 | Jul 20, 2026 |
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