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

CVSS 5.3 · Medium EPSS 0.08% · P24
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
FreeRDPFreeRDP < 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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Same Patch Batch · FreeRDP · 2026-02-25 · 15 CVEs total

CVE-2026-269558.8 HIGHFreeRDP has Out-of-bounds Write
CVE-2026-269658.8 HIGHFreeRDP has Out-of-bounds Write
CVE-2026-259414.3 MEDIUMFreeRDP: vuln_1_15_1 RDPGFX WIRE_TO_SURFACE_2 Out-of-Bounds Read
CVE-2026-25942FreeRDP has global-buffer-overflow in xf_rail_server_execute_result
CVE-2026-25953FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (freed appWindow)
CVE-2026-25952FreeRDP has heap-use-after-free in xf_SetWindowMinMaxInfo
CVE-2026-26271Buffer Overread in FreeRDP Icon Processing
CVE-2026-25959FreeRDP has heap-use-after-free in xf_cliprdr_provide_data_
CVE-2026-25997FreeRDP has heap-use-after-free in xf_clipboard_format_equal
CVE-2026-25955FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (stale XImage)
CVE-2026-25954FreeRDP has heap-use-after-free in xf_rail_server_local_move_size
CVE-2026-27015FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS
CVE-2026-26986FreeRDP has heap-use-after-free in rail_window_free
CVE-2026-27950FreeRDP 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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