Cloudanix VulnDB

CVE-2026-26965

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, in the RLE planar decode path, `planar_decompress_plane_rle()` writes into `pDstData` at `((nYDst+y) * nDstStep) + (4*nXDst) + nChannel` without verifying that `(nYDst+nSrcHeight)` fits in the destination height or that `(nXDst+nSrcWidth)` fits in the destination stride. When `TempFormat != DstFormat`, `pDstData` becomes `planar->pTempData` (sized for the desktop), while `nYDst` is only validated against the **surface** by `is_within_surface()`. A malicious RDP server can exploit this to perform a heap out-of-bounds write with attacker-controlled offset and pixel data on any connecting FreeRDP client. The OOB write reaches up to 132,096 bytes past the temp buffer end, and on the brk heap (desktop ≤ 128×128), an adjacent `NSC_CONTEXT` struct's `decode` function pointer is overwritten with attacker-controlled pixel data — control-flow–relevant corruption (function pointer overwritten) demonstrated under deterministic heap layout (`nsc->decode = 0xFF414141FF414141`). Version 3.23.0 fixes the vulnerability.

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

Related vulnerabilities