Heap Use-After-Free in FreeRDP Remote Desktop Implementation
CVE-2026-22856

6.8MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
14 January 2026

What is CVE-2026-22856?

FreeRDP, a popular free implementation of the Remote Desktop Protocol, is affected by a significant vulnerability that arises from a race condition in the serial channel IRP thread tracking. This issue occurs when one thread removes an entry from the serial->IrpThreads while another thread attempts to read it, leading to a heap use-after-free scenario. This vulnerability has been resolved in version 3.20.1, ensuring that users upgrade to this version to protect their systems from potential exploitation.

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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:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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