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CVE-2026-55648— FreeRDP: Integer Overflow in `freerdp_image_copy_from_icon_data` Bypasses Bounds Check

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组织开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.27.0之前版本存在数字错误漏洞，该漏洞源于freerdp_image_copy_from_icon_data函数在计算图标数据所需尺寸时使用32位算术导致整数溢出，可能绕过cbBitsColor源边界检查，使恶意RDP服务器通过发送特制的RAIL TS_ICON_INFO更新读取攻击者控制的图标数据。

CVSS 6.1 · Medium EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.27.0 affected
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I. Basic Information for CVE-2026-55648

Vulnerability Information
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Vulnerability Title
FreeRDP: Integer Overflow in `freerdp_image_copy_from_icon_data` Bypasses Bounds Check
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon_data in libfreerdp/codec/color.c calculates nWidth multiplied by nHeight multiplied by FreeRDPGetBytesPerPixel(format) in 32-bit arithmetic. A malicious RDP server can send a RAIL TS_ICON_INFO update with dimensions such as 32768 by 32768 and 32 bits per pixel so the required-size calculation wraps, bypassing the cbBitsColor source bounds check before freerdp_image_copy_no_overlap reads attacker-controlled icon data. This affects RemoteApp clients using the vulnerable library path, while xfreerdp has a caller-side mitigation. This issue is fixed in version 3.27.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
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 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP组织开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.27.0之前版本存在数字错误漏洞，该漏洞源于freerdp_image_copy_from_icon_data函数在计算图标数据所需尺寸时使用32位算术导致整数溢出，可能绕过cbBitsColor源边界检查，使恶意RDP服务器通过发送特制的RAIL TS_ICON_INFO更新读取攻击者控制的图标数据。
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 < 3.27.0 -

II. Public POCs for CVE-2026-55648

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III. Intelligence Information for CVE-2026-55648

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Patches & Fixes for CVE-2026-55648 (2)

Vendor Advisories for CVE-2026-55648 (1)

Vendor Pages for CVE-2026-55648 (1)

Same Patch Batch · FreeRDP · 2026-08-19 · 9 CVEs total

CVE-2026-55191 8.7 HIGH FreeRDP: Heap-buffer-overflow write in AVC444 YUV buffer allocation
CVE-2026-55194 8.7 HIGH FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE reassembly due to alloc_hint
CVE-2026-55193 8.7 HIGH FreeRDP: Heap-buffer-overflow write in TS Gateway RPC fragment receive due to uncapped bin
CVE-2026-63633 7.7 HIGH FreeRDP: Heap buffer overflow in Opus audio decode (`freerdp_dsp_decode_opus` resizes the
CVE-2026-55192 7.2 HIGH FreeRDP: Out-of-bounds read in H.264 YUV-to-RGB conversion due to decoder/surface dimensio
CVE-2026-63652 7.1 HIGH FreeRDP: Double-free of `client_formats` in the rdpsnd server channel on a malformed Clien
CVE-2026-63117 6.5 MEDIUM FreeRDP: Denial of service through ADPCM frame size calculation
CVE-2026-55564 5.4 MEDIUM FreeRDP: Out-of-bounds read in glyph_cache_get via crafted glyph fragments

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-190

V. Comments for CVE-2026-55648

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