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CVE-2026-22858

🚨 CRITICAL

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-def...

Published
Jan 14, 2026
Last Modified
Jan 20, 2026
Views
6
Bookmarks
0

Description

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FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.

Affected Products (1)

freerdp - freerdp

Version: *

CVSS Scores

CVSS 3.1 9.1
9.1
CRITICAL
CVSS 2.0 9.1

References

github.com github.com

Additional Information

Source
security-advisories@github.com
State
Analyzed

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