Unrated severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026
Heap-use-after-free in update_pointer_new
CVE-2026-23883
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, xf_Pointer_New frees cursorPixels on failure, then pointer_free calls xf_Pointer_Free and frees it again, triggering ASan UAF. 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.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/pointer.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/releases/tag/3.21.0mitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcrr-85qx-4p6xmitrex_refsource_CONFIRM
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