CVE WatchJul 15, 2026

CVE-2026-22858

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 de

CVSS

9.1

Critical

EPSS

0.6%

p47

KEV

—

Exploit Today

0-100

Published: Jan 14, 2026 · Last modified: Jul 15, 2026 · CWE-125 · CWE-758 · CWE-787

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-08-032026-08-31

Technical description

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.

Official references

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