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.
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Fixes
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References
History
Wed, 14 Jan 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | FreeRDP has a global-buffer-overflow in crypto_base64_decode | |
| Weaknesses | CWE-125 CWE-758 |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-01-14T17:56:29.729Z
Reserved: 2026-01-12T16:20:16.746Z
Link: CVE-2026-22858
Vulnrichment
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NVD
Status : Received
Published: 2026-01-14T18:16:43.520
Modified: 2026-01-14T18:16:43.520
Link: CVE-2026-22858
Redhat
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OpenCVE Enrichment
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