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

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.20.1之前版本存在安全漏洞，该漏洞源于Base64解码路径中的全局缓冲区溢出，可能导致越界访问。

CVSS 5.6 · Medium EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.20.1 affected
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I. Basic Information for CVE-2026-22858

Vulnerability Information
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Vulnerability Title
FreeRDP has a global-buffer-overflow in crypto_base64_decode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.20.1之前版本存在安全漏洞，该漏洞源于Base64解码路径中的全局缓冲区溢出，可能导致越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP < 3.20.1 -

II. Public POCs for CVE-2026-22858

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III. Intelligence Information for CVE-2026-22858

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Vendor Advisories for CVE-2026-22858 (1)

Same Patch Batch · FreeRDP · 2026-01-14 · 9 CVEs total

CVE-2026-22853 6.8 MEDIUM FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array
CVE-2026-22855 5.6 MEDIUM FreeRDP has a heap-buffer-overflow in smartcard_unpack_set_attrib_call
CVE-2026-22859 5.6 MEDIUM FreeRDP has a heap-buffer-overflow in urb_select_configuration
CVE-2026-22852 FreeRDP has a heap-buffer-overflow in audin_process_formats
CVE-2026-22851 FreeRDP RDPGFX ResetGraphics race leads to use-after-free in SDL client (sdl->primary)
CVE-2026-22854 FreeRDP has a heap-buffer-overflow in drive_process_irp_read
CVE-2026-22857 FreeRDP has a heap-use-after-free in irp_thread_func
CVE-2026-22856 FreeRDP has a heap-use-after-free in create_irp_thread

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-125

V. Comments for CVE-2026-22858

Anonymous User
2026-01-15 06:08:15

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