CVE-2026-23534
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductFreerdp
PublishedJan 19, 2026
First seenJan 19, 2026
Weakness typeCWE-122CWE-122
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| freerdp freerdp | v < 3.21.0 | 3.21.0 |
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