Race Condition Vulnerability in FreeRDP by FreeRDP Team
CVE-2026-22851

6.9MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
14 January 2026

What is CVE-2026-22851?

FreeRDP, an open-source implementation of the Remote Desktop Protocol, is affected by a race condition vulnerability stemming from improper management of dynamic virtual channels. This issue occurs between the RDPGFX dynamic virtual channel thread and the SDL render thread, which can lead to a heap use-after-free situation. An escaped pointer to the SDL_Surface, specifically 'sdl->primary', is accessed after being freed during RDPGFX handling. This creates potential security risks in affected versions, with a fix implemented in version 3.20.1.

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Affected Version(s)

FreeRDP < 3.20.1

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
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CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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