CVE-2026-23883
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductFreerdp
PublishedJan 19, 2026
First seenJan 19, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- freerdp freerdp3.21.0 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:2952
- access.redhat.com/errata/RHSA-2026:2222
- access.redhat.com/errata/RHSA-2026:2081
- access.redhat.com/errata/RHSA-2026:2770
- access.redhat.com/errata/RHSA-2026:2824
- access.redhat.com/errata/RHSA-2026:2736
- access.redhat.com/errata/RHSA-2026:3037
- access.redhat.com/errata/RHSA-2026:2048
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| freerdp freerdp | v < 3.21.0 | 3.21.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.