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TI-2026-26727 Aliases CVE-2026-34462

Sandboxie-Plus ProcessServer boxname stack buffer overflows via unterminated wide string copy

Priority LOW 33CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00174 6th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Sandboxie (sandboxie-plus): 1.17.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sandboxie-plusSandboxiebefore 1.17.31.17.3Patch availableCNA
  • Sandboxie Vendorsandboxie-plus Affected before 1.17.3 Fixed in 1.17.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*before 1.17.3Vulnerablesandboxie-plus
  • cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:* Versions before 1.17.3 Vulnerable ·sandboxie-plus

Remediation

  • Fix · CNA Sandboxie (sandboxie-plus) Fixed in 1.17.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34462

References

Exploit 1

  • TI-2025-40067 Sandboxie's Integer Overflow in SbieIniServer::RC4Crypt allows sandbox escape and SYSTEM compromise CVSS 4.0CRITICAL 9.9
  • TI-2026-26723 Sandboxie-Plus privilege escalation via INI CRLF injection bypassing EditAdminOnly CVSS 4.0CRITICAL 9.3
  • TI-2024-32948 Path traversal in Sandboxie CVSS 3.1CRITICAL 9.2
  • TI-2026-26724 Sandboxie-Plus sandbox escape via uninitialized memory leak and stack overflow in GetRawInputDeviceInfoSlave CVSS 4.0HIGH 8.8
  • TI-2026-25112 Sandboxie kernel driver denial of service via malformed IOCTL from sandboxed process CVSS 4.0HIGH 8.2
  • TI-2025-29386 Sandboxie Arbitrary Kernel Write in SbieDrv.sys API (API_GET_SECURE_PARAM) CVSS 3.1HIGH 7.8
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences