FreeRDP up to 3.27.x Orders libfreerdp/core/orders.c update_read_delta_points point_count integer overflow

Summaryinfo

A vulnerability was found in FreeRDP up to 3.27.x. It has been rated as critical. The impacted element is the function update_read_delta_points of the file libfreerdp/core/orders.c of the component Orders. The manipulation of the argument point_count leads to integer overflow. This vulnerability is referenced as CVE-2026-57156. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in FreeRDP up to 3.27.x. This issue affects the function update_read_delta_points of the file libfreerdp/core/orders.c of the component Orders. The manipulation of the argument point_count with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0 on 32-bit builds, FreeRDP clients contain an integer overflow in update_read_delta_points in libfreerdp/core/orders.c when multiplying an attacker-controlled point count by sizeof(DELTA_POINT), allowing a malicious RDP peer to allocate an undersized heap buffer and then write beyond it during initialization. This issue is fixed in version 3.28.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-57156 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful 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 3.28.0 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

License

• open-source

Website

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

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