Heap Buffer Overflow in FreeRDP Remote Desktop Protocol Implementation
CVE-2026-22853

6.8MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
14 January 2026

What is CVE-2026-22853?

The FreeRDP implementation of the Remote Desktop Protocol contains a vulnerability in the RDPEAR's NDR array reader. This issue arises due to a lack of bounds checking on the on-wire element count, which allows the potential for writing past the allocated heap buffer. As a result, malicious actors could exploit this vulnerability in ndr_read_uint8Array, leading to possible unauthorized access and data compromise. Users are recommended to upgrade to version 3.20.1 or later to mitigate this vulnerability.

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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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