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 a NAMED_PIPE_OPEN_REQ structure into a fixed WCHAR pipename[160] stack 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 that causes wcscat to read beyond the intended buffer boundary, overflowing the stack buffer. This flaw enables sandbox escape, potentially causing service crashes or arbitrary code execution as SYSTEM. The vulnerability is tracked as CVE-2026-34464 with a CVSS 4.0 score of 8.8 (high severity).
Potential Impact
Exploitation of this vulnerability allows a sandboxed process to overflow a stack buffer in the SYSTEM service, potentially leading to a crash of the SbieSvc service or arbitrary code execution with SYSTEM privileges. This represents a sandbox escape vector, undermining the isolation guarantees of Sandboxie-Plus and allowing elevated code execution.
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. No other mitigation or temporary workaround is indicated in the available data.
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.
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 a NAMED_PIPE_OPEN_REQ structure into a fixed WCHAR pipename[160] stack 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 that causes wcscat to read beyond the intended buffer boundary, overflowing the stack buffer. This flaw enables sandbox escape, potentially causing service crashes or arbitrary code execution as SYSTEM. The vulnerability is tracked as CVE-2026-34464 with a CVSS 4.0 score of 8.8 (high severity).
Potential Impact
Exploitation of this vulnerability allows a sandboxed process to overflow a stack buffer in the SYSTEM service, potentially leading to a crash of the SbieSvc service or arbitrary code execution with SYSTEM privileges. This represents a sandbox escape vector, undermining the isolation guarantees of Sandboxie-Plus and allowing elevated code execution.
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. No other mitigation or temporary workaround is indicated in the available data.
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: 5/5/2026, 8:21:24 PM
Last updated: 5/6/2026, 3:37:21 AM
Views: 7
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