Buffer Overflow Vulnerability in FreeRDP Remote Desktop Implementation
CVE-2026-22858

5.6MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
14 January 2026

What is CVE-2026-22858?

A vulnerability exists in FreeRDP's Base64 decoding path that could result in a buffer overflow due to improper handling of character signedness on Arm/AArch64 architectures. Non-ASCII bytes can bypass the expected range check, leading to potential out-of-bounds access in a global lookup table. This flaw has been resolved in version 3.20.1. Users are advised to upgrade to safeguard their systems and mitigate risks associated with this vulnerability.

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Deploy the Patch

Affected Version(s)

FreeRDP < 3.20.1

References

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

Score:
5.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
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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