Cloudanix VulnDB

CVE-2026-26955

High · 8.8

CVSS

8.8

EPSS

0.6%

Published

Feb 25, 2026

CISA due date

—

The record

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command — full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch.

Affected packages

Ecosystem Package Introduced Fixed
SUSE:Linux Enterprise Module for Package Hub 15 SP7 freerdp 0 2.11.2-150600.4.18.1
openSUSE:Leap 15.6 freerdp 0 2.11.2-150600.4.18.1
openSUSE:Tumbleweed freerdp 0 3.24.1-1.1
openSUSE:Tumbleweed freerdp2 0 2.11.7-6.1

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