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
CVE-2026-34462 is a stack-based buffer overflow vulnerability in Sandboxie-Plus (<=1.17.2) affecting ProcessServer handlers KillAllHandler, SuspendAllHandler, and RunSandboxedHandler. These handlers copy a fixed-size WCHAR boxname[34] from request structures into a larger WCHAR[40] stack buffer using wcscpy without verifying null termination. Because the service pipe accepts packets larger than the request structure and is created with a NULL DACL, any local process can send crafted data that overflows the stack buffer before authorization checks occur. This can cause service crashes or potentially allow code execution with SYSTEM privileges. The vulnerability is addressed in version 1.17.3.
Potential Impact
Exploitation can lead to a denial of service by crashing the SbieSvc service or potentially allow local attackers to execute arbitrary code with SYSTEM privileges due to the stack buffer overflow. The vulnerability is exploitable by any local process because the service pipe has a NULL DACL and authorization checks occur after the unsafe copy operation.
Mitigation Recommendations
This vulnerability is fixed in Sandboxie-Plus version 1.17.3. Users should upgrade to version 1.17.3 or later to remediate this issue. No other mitigations are indicated by the vendor advisory.
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.
CVSS v4.0
Score 7.3high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34462 is a stack-based buffer overflow vulnerability in Sandboxie-Plus (<=1.17.2) affecting ProcessServer handlers KillAllHandler, SuspendAllHandler, and RunSandboxedHandler. These handlers copy a fixed-size WCHAR boxname[34] from request structures into a larger WCHAR[40] stack buffer using wcscpy without verifying null termination. Because the service pipe accepts packets larger than the request structure and is created with a NULL DACL, any local process can send crafted data that overflows the stack buffer before authorization checks occur. This can cause service crashes or potentially allow code execution with SYSTEM privileges. The vulnerability is addressed in version 1.17.3.
Potential Impact
Exploitation can lead to a denial of service by crashing the SbieSvc service or potentially allow local attackers to execute arbitrary code with SYSTEM privileges due to the stack buffer overflow. The vulnerability is exploitable by any local process because the service pipe has a NULL DACL and authorization checks occur after the unsafe copy operation.
Mitigation Recommendations
This vulnerability is fixed in Sandboxie-Plus version 1.17.3. Users should upgrade to version 1.17.3 or later to remediate this issue. No other mitigations are indicated by the vendor advisory.
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: 5/13/2026, 3:39:23 AM
Last updated: 6/20/2026, 1:46:33 AM
Views: 91
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