CVE-2026-34464: CWE-121: Stack-based Buffer Overflow in sandboxie-plus Sandboxie
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using wcscat without verifying null termination. The handler only enforces a minimum packet size, and since the service pipe accepts variable-length messages, a sandboxed caller can fill the server[48] field with non-zero data and append additional controlled wide characters after the structure.wcscat then reads past the fixed field and overflows the stack buffer in the SYSTEM service. This message is restricted to sandboxed callers, making it a sandbox escape vector. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3.
AI Analysis
Technical Summary
Sandboxie-Plus, an open source sandbox isolation tool for Windows, contains a stack-based buffer overflow in versions prior to 1.17.3. The vulnerability arises because NamedPipeServer::OpenHandler uses wcscat to concatenate a server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] buffer without verifying null termination. Since the service pipe accepts variable-length messages and only enforces a minimum packet size, a sandboxed caller can craft input to overflow the stack buffer. This can lead to a crash of the SbieSvc service or potentially allow code execution as SYSTEM, effectively escaping the sandbox environment. The vulnerability is tracked as CWE-121 (stack-based buffer overflow) and CWE-170 (improper null termination).
Potential Impact
Exploitation of this vulnerability can cause the SbieSvc service to crash or potentially allow an attacker with sandboxed privileges to execute arbitrary code with SYSTEM-level privileges, resulting in a sandbox escape. This elevates the attacker's privileges beyond the sandbox restrictions, posing a significant security risk.
Mitigation Recommendations
This vulnerability has been fixed in Sandboxie-Plus version 1.17.3. Users should upgrade to version 1.17.3 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official software update. Patch status is confirmed by the vendor fix in version 1.17.3.
CVE-2026-34464: CWE-121: Stack-based Buffer Overflow in sandboxie-plus Sandboxie
Description
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using wcscat without verifying null termination. The handler only enforces a minimum packet size, and since the service pipe accepts variable-length messages, a sandboxed caller can fill the server[48] field with non-zero data and append additional controlled wide characters after the structure.wcscat then reads past the fixed field and overflows the stack buffer in the SYSTEM service. This message is restricted to sandboxed callers, making it a sandbox escape vector. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3.
CVSS v4.0
Score 8.8high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Sandboxie-Plus, an open source sandbox isolation tool for Windows, contains a stack-based buffer overflow in versions prior to 1.17.3. The vulnerability arises because NamedPipeServer::OpenHandler uses wcscat to concatenate a server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] buffer without verifying null termination. Since the service pipe accepts variable-length messages and only enforces a minimum packet size, a sandboxed caller can craft input to overflow the stack buffer. This can lead to a crash of the SbieSvc service or potentially allow code execution as SYSTEM, effectively escaping the sandbox environment. The vulnerability is tracked as CWE-121 (stack-based buffer overflow) and CWE-170 (improper null termination).
Potential Impact
Exploitation of this vulnerability can cause the SbieSvc service to crash or potentially allow an attacker with sandboxed privileges to execute arbitrary code with SYSTEM-level privileges, resulting in a sandbox escape. This elevates the attacker's privileges beyond the sandbox restrictions, posing a significant security risk.
Mitigation Recommendations
This vulnerability has been fixed in Sandboxie-Plus version 1.17.3. Users should upgrade to version 1.17.3 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official software update. Patch status is confirmed by the vendor fix in version 1.17.3.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-27T18:18:14.896Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fa4dc2cbff5d86102152a9
Added to database: 5/5/2026, 8:06:26 PM
Last enriched: 5/13/2026, 3:39:29 AM
Last updated: 6/20/2026, 12:33:48 AM
Views: 76
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