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CVE-2026-44421

8.8 · HIGH

FreeRDP is a free implementation of the Remote Desktop Protocol.

Published May 29, 2026CWE-122EPSS 0.72%

Overview

CVE-2026-44421 is a high-severity vulnerability. It was published on May 29, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. 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 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

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/security/advisories/GHSA-p6r2-4hgm-m6ffRefaccess.redhat.com/errata/RHSA-2026:36203Refaccess.redhat.com/errata/RHSA-2026:46393Refaccess.redhat.com/security/cve/CVE-2026-44421Refbugzilla.redhat.com/show_bug.cgi?id=2483471GitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ffRefsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44421.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-44421?

CVE-2026-44421 is a high-severity vulnerability. It was published on May 29, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-44421?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-44421?

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-2026-44421?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-44421 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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