# CVE-2026-34462

## Summary

- **CVE ID:** CVE-2026-34462
- **Severity:** HIGH
- **CVSS Score:** 7.3 (CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121, CWE-170
- **Published:** May 5, 2026
- **Last Modified:** May 7, 2026

## 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.

## Affected Products

- sandboxie-plus — Sandboxie (< 1.17.3)

## References

- [CNA](https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-9cjg-vh9m-hhx4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 7.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._