CVE-2026-23884 — CRITICAL (9.8)

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Freerdp	Freerdp	< 3.21.0

Related Weaknesses (CWE)

CWE-416

References

https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727cProduct
https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727cProduct
https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0Release Notes
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cfgj-vc84-f3ppVendor AdvisoryExploit

FAQ

What is CVE-2026-23884?

CVE-2026-23884 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 pack...

How severe is CVE-2026-23884?

CVE-2026-23884 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-23884?

Check the references section above for vendor advisories and patch information. Affected products include: Freerdp Freerdp.