CVE-2026-34462: 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, several ProcessServer handlers (KillAllHandler, SuspendAllHandler, and RunSandboxedHandler) copy a WCHAR boxname[34] field from request structures into WCHAR[40] stack buffers using wcscpy without verifying null termination. Because the service pipe accepts variable-length packets larger than the request structure, an attacker can fill the boxname field with non-zero data and append additional controlled wide characters after the structure. wcscpy then reads past the fixed field and overflows the destination stack buffer. The service pipe is created with a NULL DACL, allowing any local process to connect, and the unsafe copy occurs before authorization checks. 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 (CWE-121) in versions prior to 1.17.3. The vulnerability arises from unsafe copying of a WCHAR boxname field from request structures into stack buffers using wcscpy without verifying null termination. The service pipe accepts variable-length packets larger than the request structure and is created with a NULL DACL, allowing any local process to connect. This leads to an overflow of the destination stack buffer, potentially causing a crash or code execution as SYSTEM. The flaw affects ProcessServer handlers KillAllHandler, SuspendAllHandler, and RunSandboxedHandler. The vulnerability has a CVSS 4.0 score of 7.3 (high severity) and was fixed in version 1.17.3.
Potential Impact
Exploitation of this vulnerability can cause the SbieSvc service to crash or potentially allow an attacker to execute arbitrary code with SYSTEM privileges on the affected system. Because the service pipe is created with a NULL DACL, any local process can connect and send maliciously crafted packets to trigger the overflow before authorization checks, increasing the risk of local privilege escalation.
Mitigation Recommendations
Upgrade Sandboxie-Plus to version 1.17.3 or later, where this vulnerability has been fixed. Until the upgrade is applied, restrict local access to the service pipe if possible to limit exposure. Patch status is confirmed fixed in version 1.17.3.
CVE-2026-34462: 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, several ProcessServer handlers (KillAllHandler, SuspendAllHandler, and RunSandboxedHandler) copy a WCHAR boxname[34] field from request structures into WCHAR[40] stack buffers using wcscpy without verifying null termination. Because the service pipe accepts variable-length packets larger than the request structure, an attacker can fill the boxname field with non-zero data and append additional controlled wide characters after the structure. wcscpy then reads past the fixed field and overflows the destination stack buffer. The service pipe is created with a NULL DACL, allowing any local process to connect, and the unsafe copy occurs before authorization checks. 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 (CWE-121) in versions prior to 1.17.3. The vulnerability arises from unsafe copying of a WCHAR boxname field from request structures into stack buffers using wcscpy without verifying null termination. The service pipe accepts variable-length packets larger than the request structure and is created with a NULL DACL, allowing any local process to connect. This leads to an overflow of the destination stack buffer, potentially causing a crash or code execution as SYSTEM. The flaw affects ProcessServer handlers KillAllHandler, SuspendAllHandler, and RunSandboxedHandler. The vulnerability has a CVSS 4.0 score of 7.3 (high severity) and was fixed in version 1.17.3.
Potential Impact
Exploitation of this vulnerability can cause the SbieSvc service to crash or potentially allow an attacker to execute arbitrary code with SYSTEM privileges on the affected system. Because the service pipe is created with a NULL DACL, any local process can connect and send maliciously crafted packets to trigger the overflow before authorization checks, increasing the risk of local privilege escalation.
Mitigation Recommendations
Upgrade Sandboxie-Plus to version 1.17.3 or later, where this vulnerability has been fixed. Until the upgrade is applied, restrict local access to the service pipe if possible to limit exposure. Patch status is confirmed fixed 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: 69fa4dc2cbff5d86102152a6
Added to database: 5/5/2026, 8:06:26 PM
Last enriched: 5/5/2026, 8:21:29 PM
Last updated: 5/6/2026, 3:53:58 AM
Views: 6
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