FreeRDP up to 3.22.x Stream_EnsureCapacity integer overflow

Summaryinfo

A vulnerability labeled as problematic has been found in FreeRDP up to 3.22.x. Affected is the function Stream_EnsureCapacity. Executing a manipulation can lead to integer overflow. This vulnerability is handled as CVE-2026-27951. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in FreeRDP up to 3.22.x. This vulnerability affects the function Stream_EnsureCapacity. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-27951 since 02/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 300278 (Linux Distros Unpatched Vulnerability : CVE-2026-27951), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.23.0 eliminates this vulnerability. Applying the patch 118afc0b954ba9d5632b7836ad24e454555ed113 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (300278) and CERT Bund (WID-SEC-2026-0514). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• Fedora Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source FreeRDP

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

License

• open-source

Website

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

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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