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CVE-2026-23884

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Date: January 19, 2026

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, offscreen bitmap deletion leaves "gdi->drawing" pointing to freed memory, causing UAF when related update packets arrive. A malicious server can trigger a client‑side use after free, 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.

Severity Score

Related Resources (6)

https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L114-L122
https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0
https://nvd.nist.gov/vuln/detail/CVE-2026-23884
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cfgj-vc84-f3pp
https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L87-L91
https://www.mend.io/vulnerability-database/CVE-2026-23884

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

Top Fix

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Upgrade Version

Upgrade to version https://github.com/FreeRDP/FreeRDP.git - 3.21.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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