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CVE-2026-27951— FreeRDP has possible Integer overflow in Stream_EnsureCapacity

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之前版本存在输入验证错误漏洞，该漏洞源于Stream_EnsureCapacity函数可能创建无限阻塞循环，可能导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27951

Vulnerability Information
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Vulnerability Title
FreeRDP has possible Integer overflow in Stream_EnsureCapacity
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于Stream_EnsureCapacity函数可能创建无限阻塞循环，可能导致拒绝服务。
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-2026-27951

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III. Intelligence Information for CVE-2026-27951

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Patches & Fixes for CVE-2026-27951 (1)

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

CVE-2026-26955 8.8 HIGH FreeRDP has Out-of-bounds Write
CVE-2026-26965 8.8 HIGH FreeRDP has Out-of-bounds Write
CVE-2026-26986 5.5 MEDIUM FreeRDP has heap-use-after-free in rail_window_free
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-2026-27950 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-190

V. Comments for CVE-2026-27951

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