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CVE-2026-31806

9.8 · CRITICAL

FreeRDP is a free implementation of the Remote Desktop Protocol.

Published Mar 13, 2026CWE-122EPSS 0.67%

Overview

CVE-2026-31806 is a critical-severity vulnerability. It was published on March 13, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2bGitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2Refaccess.redhat.com/errata/RHSA-2026:10076Refaccess.redhat.com/errata/RHSA-2026:10734Refaccess.redhat.com/errata/RHSA-2026:10735Refaccess.redhat.com/errata/RHSA-2026:10951Refaccess.redhat.com/errata/RHSA-2026:11323Refaccess.redhat.com/errata/RHSA-2026:19033Refaccess.redhat.com/errata/RHSA-2026:6340Refaccess.redhat.com/errata/RHSA-2026:6727

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31806?

CVE-2026-31806 is a critical-severity vulnerability. It was published on March 13, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31806?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31806?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31806?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31806 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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