Heap Buffer Overflow Vulnerability in FreeRDP Remote Desktop Protocol Implementation
CVE-2026-23531

7.7HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
19 January 2026

What is CVE-2026-23531?

The FreeRDP implementation of the Remote Desktop Protocol contains a vulnerability where processed glyphData may lead to a heap buffer overflow. In versions prior to 3.21.0, the clear_decompress function fails to validate the destination rectangle during certain RDPGFX surface updates. This oversight allows an attacker controlling a malicious server to initiate a client-side attack, potentially resulting in a crash and leading to serious data corruption risks. The newly released version 3.21.0 addresses this issue by implementing necessary patches to enhance security.

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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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