CVE-2026-22858 - FreeRDP has a global-buffer-overflow in crypto_base64_decode

CVE-2026-22858 - FreeRDP has a global-buffer-overflow in crypto_base64_decode

https://cvefeed.io/rssfeed/latest.atom / Wed, 01/14/2026 - 22:57
CVE ID : CVE-2026-22858
Published : Jan. 14, 2026, 6:16 p.m. | 3 hours, 40 minutes ago
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.
Severity: 5.6 | MEDIUM
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