FreeRDP up to 3.28.x Clipboard heap-based overflow

Summaryinfo

A vulnerability identified as critical has been detected in FreeRDP up to 3.28.x. This affects an unknown function of the component Clipboard. This manipulation causes heap-based overflow. This vulnerability is handled as CVE-2026-67305. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.28.x. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Clipboard. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a paste operation.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-67305 since 07/29/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 3.29.0 eliminates this vulnerability.

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Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28

License

• open-source

Website

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

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