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CVE-2026-23534

9.8 · CRITICAL

FreeRDP is a free implementation of the Remote Desktop Protocol.

Published Jan 19, 2026CWE-122EPSS 0.53%

Overview

CVE-2026-23534 is a critical-severity vulnerability. It was published on January 19, 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 version 3.21.0, a client-side heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

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/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L878-L879GitHubgithub.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L883-L884GitHubgithub.com/FreeRDP/FreeRDP/releases/tag/3.21.0GitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-3frr-mp8w-4599Refaccess.redhat.com/errata/RHSA-2026:2048Refaccess.redhat.com/errata/RHSA-2026:2081Refaccess.redhat.com/errata/RHSA-2026:2222Refaccess.redhat.com/errata/RHSA-2026:2736Refaccess.redhat.com/errata/RHSA-2026:2952Refaccess.redhat.com/errata/RHSA-2026:3037

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23534?

CVE-2026-23534 is a critical-severity vulnerability. It was published on January 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-23534?

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-2026-23534?

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-2026-23534?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23534 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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