FreeRDP up to 3.31.x License Check Stream license_check_stream_length scopeCount heap-based overflow

Summaryinfo

A vulnerability classified as problematic was found in FreeRDP up to 3.31.x. Impacted is the function license_check_stream_length of the component License Check Stream. Executing a manipulation of the argument scopeCount can lead to heap-based overflow. The identification of this vulnerability is CVE-2026-109255. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.31.x. It has been declared as problematic. This vulnerability affects the function license_check_stream_length of the component License Check Stream. The manipulation of the argument scopeCount 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 integrity, and availability. CVE summarizes:

FreeRDP 3.0.0 before 3.32.0 contains an integer truncation vulnerability in license_check_stream_length that allows a malicious RDP server to trigger a heap buffer overflow on 32-bit clients. Attackers can send a crafted SERVER_LICENSE_REQUEST with a large scopeCount that bypasses length checks, causing out-of-bounds writes leading to denial of service or remote code execution.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-109255 since 10/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 3.32.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

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
• 3.29
• 3.30
• 3.31

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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