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CVE-2026-26965— FreeRDP has Out-of-bounds Write

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.23.0之前版本存在缓冲区错误漏洞，该漏洞源于RLE平面解码路径中缺少边界检查，可能导致堆越界写入。

CVSS 8.8 · High EPSS 0.59% · P46

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.23.0 affected
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I. Basic Information for CVE-2026-26965

Vulnerability Information
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Vulnerability Title
FreeRDP has Out-of-bounds Write
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.23.0之前版本存在缓冲区错误漏洞，该漏洞源于RLE平面解码路径中缺少边界检查，可能导致堆越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP < 3.23.0 -

II. Public POCs for CVE-2026-26965

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III. Intelligence Information for CVE-2026-26965

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Same Patch Batch · FreeRDP · 2026-02-25 · 15 CVEs total

CVE-2026-26955 8.8 HIGH FreeRDP has Out-of-bounds Write
CVE-2026-27951 5.3 MEDIUM FreeRDP has possible Integer overflow in Stream_EnsureCapacity
CVE-2026-25941 4.3 MEDIUM FreeRDP: vuln_1_15_1 RDPGFX WIRE_TO_SURFACE_2 Out-of-Bounds Read
CVE-2026-25942 FreeRDP has global-buffer-overflow in xf_rail_server_execute_result
CVE-2026-25953 FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (freed appWindow)
CVE-2026-25952 FreeRDP has heap-use-after-free in xf_SetWindowMinMaxInfo
CVE-2026-26271 Buffer Overread in FreeRDP Icon Processing
CVE-2026-25959 FreeRDP has heap-use-after-free in xf_cliprdr_provide_data_
CVE-2026-25997 FreeRDP has heap-use-after-free in xf_clipboard_format_equal
CVE-2026-25955 FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (stale XImage)
CVE-2026-25954 FreeRDP has heap-use-after-free in xf_rail_server_local_move_size
CVE-2026-27015 FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS
CVE-2026-26986 FreeRDP has heap-use-after-free in rail_window_free
CVE-2026-27950 FreeRDP heap-use-after-free in update_pointer_new(SDL): Fix Applied in the Wrong File

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-787

V. Comments for CVE-2026-26965

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