FreeRDP <3.21.0 UAF via Offscreen Bitmap deletion
CVE-2026-23884 Published on January 19, 2026
Heap-use-after-free in gdi_set_bounds
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 clientside use after free, causing a crash (DoS) and potential heap corruption with codeexecution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-23884 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-23884
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Affected Versions
FreeRDP Version < 3.21.0 is affected by CVE-2026-23884Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.