Heap Buffer Overflow in FreeRDP Client Affects Remote Desktop Protocol
CVE-2026-23532

7.7HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
19 January 2026

What is CVE-2026-23532?

FreeRDP, a widely used free implementation of the Remote Desktop Protocol, has a vulnerability that leads to a client-side heap buffer overflow. This issue arises from a mismatch between destination rectangle clamping and the copy size within the gdi_SurfaceToSurface function. An attacker controlling a malicious server can exploit this vulnerability to trigger the heap overflow, potentially leading to client crashes (Denial of Service) and risks of heap corruption, with possible code execution depending on the allocator and surrounding heap layout. It is critical to upgrade to version 3.21.0 or later to mitigate this risk.

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Affected Version(s)

FreeRDP < 3.21.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945...
x_refsource_MISC
https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0
x_refsource_MISC

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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