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CVE-2026-55564

5.4 · MEDIUM

FreeRDP is a free implementation of the Remote Desktop Protocol.

Published Aug 19, 2026CWE-125EPSS 0.44%

Overview

CVE-2026-55564 is a medium-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. 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 3.27.0, the glyph_cache_get function in libfreerdp/cache/glyph.c checks whether index is greater than cache->number instead of greater than or equal to it. A malicious RDP server can use GLYPH_FRAGMENT_USE replay in update_process_glyph_fragments to make the default cache receive index 254 when cache->number is 254, reading one pointer beyond the entries array and dereferencing it as a glyph. This can crash the client and may disclose adjacent heap data. This issue is fixed in version 3.27.0.

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/c29324750e3cbcba8761f147b7a5235cc686930fGitHubgithub.com/FreeRDP/FreeRDP/pull/12885GitHubgithub.com/FreeRDP/FreeRDP/releases/tag/3.27.0GitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4cGitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55564?

CVE-2026-55564 is a medium-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-55564?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55564?

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-2026-55564?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55564 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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