{"api_version":"1","generated_at":"2026-07-23T13:30:56+00:00","cve":"CVE-2026-22858","urls":{"html":"https://cve.report/CVE-2026-22858","api":"https://cve.report/api/cve/CVE-2026-22858.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-22858","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-22858"},"summary":{"title":"FreeRDP has a global-buffer-overflow in crypto_base64_decode","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. 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