FreeRDP up to 3.26.9 Color Codec libfreerdp/codec/color.c freerdp_image_copy_from_icon_data memory corruption

Summaryinfo

A vulnerability was found in FreeRDP up to 3.26.9. It has been rated as critical. The affected element is the function freerdp_image_copy_from_icon_data of the file libfreerdp/codec/color.c of the component Color Codec. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2026-55648. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in FreeRDP up to 3.26.9. This affects the function freerdp_image_copy_from_icon_data of the file libfreerdp/codec/color.c of the component Color Codec. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-55648 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.27.0 eliminates this vulnerability.

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Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.26.0
• 3.26.1
• 3.26.2
• 3.26.3
• 3.26.4
• 3.26.5
• 3.26.6
• 3.26.7
• 3.26.8
• 3.26.9

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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